{"title":"Shippable Aquarium Heaters","description":"\u003cp\u003eShop in-stock aquarium heaters eligible for UPS shipping.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e$12.99 flat-rate UPS shipping\u003c\/strong\u003e applies to eligible orders to selected U.S. destinations; shipping options are confirmed at checkout. Pickup-only products cannot be shipped.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/shop-shippable-aquarium-supplies\"\u003eBrowse all shippable aquarium supplies\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"sicce-scuba-preset-50w-aquarium-heater","title":"SICCE Scuba Preset 50W Aquarium Heater – 10 to 15 Gallons","description":"\u003cp\u003eThe SICCE Scuba Preset 50W Aquarium Heater is a compact, fully submersible electronic heater designed to provide dependable temperature control in nano and small aquariums. It is factory preset to approximately 77°F, or 25°C, making it a convenient option for aquariums that do not require an adjustable temperature setting.\u003c\/p\u003e\n\u003cp\u003eDesigned for aquariums between approximately 10 and 15 US gallons, the 50-watt Scuba Preset features high-thermal-density, shatter-resistant glass, an electronic thermostat, thermal safety shutoff, an ON\/OFF indicator light, and strong suction cups for secure installation.\u003c\/p\u003e\n\u003cp\u003eThe preset thermostat maintains a temperature of approximately 77°F with a stated tolerance of ±2°F. Actual aquarium temperature can also be affected by room temperature, aquarium volume, water circulation, lid coverage, and placement, so a separate aquarium thermometer is always recommended.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset to 77°F:\u003c\/strong\u003e Factory set to approximately 77°F, or 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Temperature Control:\u003c\/strong\u003e Automatically cycles on and off to maintain the preset temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for 10–15 Gallons:\u003c\/strong\u003e Suitable for many nano and small aquarium setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50-Watt Heating Output:\u003c\/strong\u003e Provides reliable heating when correctly matched to aquarium size and room conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Submersible:\u003c\/strong\u003e Designed for underwater installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-Resistant Glass:\u003c\/strong\u003e High-thermal-density glass construction provides added durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Safety Shutoff:\u003c\/strong\u003e Built-in protection helps reduce the risk of overheating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eON\/OFF Indicator Light:\u003c\/strong\u003e Makes it easy to see when the heater is actively heating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Suction Cups:\u003c\/strong\u003e Helps keep the heater firmly positioned inside the aquarium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlim Profile:\u003c\/strong\u003e Designed to minimize visual impact inside the tank\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e SICCE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Scuba Preset Aquarium Heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 50W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 50 watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Aquarium Capacity:\u003c\/strong\u003e 10–15 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric Aquarium Capacity:\u003c\/strong\u003e 40–60 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset Temperature:\u003c\/strong\u003e 77°F \/ 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Tolerance:\u003c\/strong\u003e Approximately ±2°F \/ ±1°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Adjustment:\u003c\/strong\u003e Not adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Shatter-resistant glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicator:\u003c\/strong\u003e ON\/OFF heating light\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Feature:\u003c\/strong\u003e Thermal safety shutoff\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e Approximately 6 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible with suction-cup mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e10-gallon aquariums\u003c\/li\u003e\n\u003cli\u003eSmall aquariums up to approximately 15 gallons\u003c\/li\u003e\n\u003cli\u003eBetta aquariums\u003c\/li\u003e\n\u003cli\u003eSmall tropical community aquariums\u003c\/li\u003e\n\u003cli\u003eShrimp aquariums that require approximately 77°F\u003c\/li\u003e\n\u003cli\u003eSmall planted aquariums\u003c\/li\u003e\n\u003cli\u003eQuarantine and observation tanks\u003c\/li\u003e\n\u003cli\u003eAquariums where a simple preset heater is preferred\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePreset Temperature\u003c\/h3\u003e\n\u003cp\u003eThe SICCE Scuba Preset is factory set to maintain approximately 77°F, or 25°C. The manufacturer lists a normal operating tolerance of approximately ±2°F, meaning the measured water temperature may normally vary within a small range around the preset point.\u003c\/p\u003e\n\u003cp\u003eThis heater is not adjustable. It is most appropriate for fish, shrimp, plants, and other aquarium inhabitants whose preferred temperature range includes approximately 75–79°F.\u003c\/p\u003e\n\u003cp\u003eDo not choose a preset heater solely because it fits the aquarium’s gallon capacity. Confirm that 77°F is suitable for every species in the aquarium.\u003c\/p\u003e\n\u003ch3\u003eRecommended Aquarium Size\u003c\/h3\u003e\n\u003cp\u003eSICCE rates the 50W Scuba Preset for aquariums between approximately 10 and 15 US gallons.\u003c\/p\u003e\n\u003cp\u003eThe correct heater size depends on more than aquarium volume. Heating performance may also be influenced by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRoom temperature\u003c\/li\u003e\n\u003cli\u003eDifference between room temperature and desired water temperature\u003c\/li\u003e\n\u003cli\u003eAquarium shape and exposed surface area\u003c\/li\u003e\n\u003cli\u003eOpen-top or covered design\u003c\/li\u003e\n\u003cli\u003eWater circulation\u003c\/li\u003e\n\u003cli\u003eDrafts and nearby windows\u003c\/li\u003e\n\u003cli\u003eAmount of water displaced by substrate and decorations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA 50W heater may be insufficient for a 15-gallon aquarium located in a very cold room, while it may provide more than enough heating for a covered 10-gallon aquarium in a warm room.\u003c\/p\u003e\n\u003ch3\u003eSICCE Scuba Preset Heater Sizing Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50W:\u003c\/strong\u003e 10–15 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100W:\u003c\/strong\u003e 20–35 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150W:\u003c\/strong\u003e 31–45 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e200W:\u003c\/strong\u003e 40–60 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250W:\u003c\/strong\u003e 53–75 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300W:\u003c\/strong\u003e 65–90 US gallons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese are SICCE’s published capacity ranges. Select the model based on aquarium volume, room conditions, and the amount of temperature increase required.\u003c\/p\u003e\n\u003ch3\u003eInstallation Instructions\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInspect the heater and power cord before installation.\u003c\/li\u003e\n\u003cli\u003eDo not use the heater if the glass, cord, plug, or housing appears damaged.\u003c\/li\u003e\n\u003cli\u003eAttach the supplied suction cups and mounting bracket.\u003c\/li\u003e\n\u003cli\u003ePlace the heater fully underwater in the aquarium.\u003c\/li\u003e\n\u003cli\u003ePosition it near steady water circulation from a filter outlet or pump.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to sit submerged and unplugged for approximately 15 minutes before connecting power.\u003c\/li\u003e\n\u003cli\u003eCreate a drip loop in the power cord below the electrical outlet.\u003c\/li\u003e\n\u003cli\u003ePlug the heater into a properly protected outlet.\u003c\/li\u003e\n\u003cli\u003eMonitor aquarium temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eAlways consult the included SICCE instructions before installation and use.\u003c\/p\u003e\n\u003ch3\u003eBest Heater Placement\u003c\/h3\u003e\n\u003cp\u003eInstall the heater in an area with consistent water movement so warmed water is distributed throughout the aquarium. Placement near a filter return, internal filter, or circulation pump can help reduce hot and cold areas.\u003c\/p\u003e\n\u003cp\u003eAvoid burying the heater in gravel or placing it where decorations prevent water from circulating around the glass body.\u003c\/p\u003e\n\u003cp\u003eKeep the heater fully submerged during operation and ensure that it remains securely attached to the aquarium wall.\u003c\/p\u003e\n\u003ch3\u003eHorizontal or Vertical Placement\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset may be positioned according to the aquarium layout and the manufacturer’s installation instructions, provided it remains fully submerged and has adequate water circulation around it.\u003c\/p\u003e\n\u003cp\u003eA horizontal or slightly angled position low in the aquarium may help distribute heat efficiently, particularly when warm water rises toward the surface. A vertical position may be more convenient in narrow tanks.\u003c\/p\u003e\n\u003cp\u003eDo not allow the heater to rest directly against substrate, rock, wood, or aquarium decorations.\u003c\/p\u003e\n\u003ch3\u003eUsing a Separate Thermometer\u003c\/h3\u003e\n\u003cp\u003eAlways use an independent aquarium thermometer with any heater, including preset models.\u003c\/p\u003e\n\u003cp\u003eA thermometer allows the aquarium owner to confirm that:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe heater is operating correctly\u003c\/li\u003e\n\u003cli\u003eThe aquarium is staying within the species-appropriate range\u003c\/li\u003e\n\u003cli\u003eThe room is not too cold for the heater’s wattage\u003c\/li\u003e\n\u003cli\u003eThe aquarium is not overheating\u003c\/li\u003e\n\u003cli\u003eWater circulation is distributing heat evenly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck the thermometer daily as part of routine aquarium maintenance.\u003c\/p\u003e\n\u003ch3\u003eON\/OFF Indicator Light\u003c\/h3\u003e\n\u003cp\u003eThe built-in indicator light shows when the heater is actively operating. The light will normally turn on when heating is required and turn off when the thermostat reaches the preset temperature.\u003c\/p\u003e\n\u003cp\u003eThe light cycling on and off is normal. The heater does not need to remain continuously illuminated to maintain temperature.\u003c\/p\u003e\n\u003cp\u003eIf the light remains on continuously while the aquarium stays below the desired temperature, the heater may be undersized for the aquarium or room conditions.\u003c\/p\u003e\n\u003ch3\u003eThermal Safety Shutoff\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset includes thermal safety protection designed to reduce the risk of overheating.\u003c\/p\u003e\n\u003cp\u003eThis feature should not replace proper heater handling. Never intentionally operate the heater outside the water, and always unplug it before performing a water change or removing it from the aquarium.\u003c\/p\u003e\n\u003ch3\u003eWater-Change Safety\u003c\/h3\u003e\n\u003cp\u003eUnplug the heater before lowering the aquarium water level. A heater that remains powered while exposed to air may become extremely hot and could be damaged when cooler water contacts the glass.\u003c\/p\u003e\n\u003cp\u003eAfter unplugging, allow the heater to cool while still submerged before removing it or draining water below its position.\u003c\/p\u003e\n\u003cp\u003eAfter refilling the aquarium, allow the heater to remain fully submerged for approximately 15 minutes before plugging it back in.\u003c\/p\u003e\n\u003ch3\u003eFreshwater and Marine Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eSICCE states that the Scuba Preset can be installed in different types of aquariums. It may be used in appropriate freshwater or marine systems when installed and maintained according to the manufacturer’s directions.\u003c\/p\u003e\n\u003cp\u003eIn saltwater aquariums, regularly inspect the heater, cord, bracket, and suction cups for salt buildup. Disconnect power before cleaning.\u003c\/p\u003e\n\u003ch3\u003eUse in Planted Aquariums\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset may be used in planted aquariums when the preset temperature is appropriate for the plants, fish, shrimp, and other inhabitants.\u003c\/p\u003e\n\u003cp\u003ePosition the heater where plant growth will not block circulation or conceal damage during routine inspection.\u003c\/p\u003e\n\u003cp\u003eThe heater does not provide light, carbon dioxide, fertilizer, or other plant nutrients.\u003c\/p\u003e\n\u003ch3\u003eUse with Bettas\u003c\/h3\u003e\n\u003cp\u003eMany betta aquariums require a heater because indoor room temperature may not provide stable tropical conditions.\u003c\/p\u003e\n\u003cp\u003eThe 50W Scuba Preset is officially rated for 10–15 gallons. It may be too powerful or physically large for very small betta bowls or nano containers below the manufacturer’s recommended capacity.\u003c\/p\u003e\n\u003cp\u003eUse a thermometer and confirm that approximately 77°F is suitable for the individual aquarium setup.\u003c\/p\u003e\n\u003ch3\u003eUse with Shrimp\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in shrimp aquariums when approximately 77°F is appropriate for the shrimp species being maintained.\u003c\/p\u003e\n\u003cp\u003eSome Caridina shrimp and other cool-water species may prefer temperatures below the heater’s preset point. Research the temperature requirements of the specific shrimp before installation.\u003c\/p\u003e\n\u003cp\u003eHeaters do not regulate GH, KH, pH, minerals, ammonia, nitrite, nitrate, or other water parameters required by shrimp.\u003c\/p\u003e\n\u003ch3\u003eUse in Quarantine Tanks\u003c\/h3\u003e\n\u003cp\u003eThe 50W Scuba Preset can provide convenient heating for appropriately sized quarantine or observation aquariums when 77°F is suitable for the fish being housed.\u003c\/p\u003e\n\u003cp\u003eSome disease-treatment protocols require temperatures different from 77°F. Because this model is not adjustable, it may not be suitable when a precise treatment temperature must be selected.\u003c\/p\u003e\n\u003cp\u003eDisinfect aquarium equipment carefully between quarantine uses and follow SICCE’s cleaning instructions.\u003c\/p\u003e\n\u003ch3\u003ePreset vs. Adjustable Heaters\u003c\/h3\u003e\n\u003cp\u003eA preset heater is a good choice when simplicity is the priority and the aquarium inhabitants are suitable for approximately 77°F.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset Heater:\u003c\/strong\u003e Simple operation with no temperature adjustment required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Heater:\u003c\/strong\u003e Allows the temperature to be selected for specialized fish, breeding, quarantine, or seasonal needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eChoose an adjustable heater when the aquarium requires a temperature outside the Scuba Preset’s normal operating range.\u003c\/p\u003e\n\u003ch3\u003eTemperature Monitoring Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the aquarium temperature daily\u003c\/li\u003e\n\u003cli\u003ePlace the thermometer away from the heater\u003c\/li\u003e\n\u003cli\u003eConfirm temperature at different areas of larger aquariums\u003c\/li\u003e\n\u003cli\u003eWatch for seasonal room-temperature changes\u003c\/li\u003e\n\u003cli\u003eIncrease water circulation if hot or cold areas develop\u003c\/li\u003e\n\u003cli\u003eInspect the heater after power outages\u003c\/li\u003e\n\u003cli\u003eReplace damaged or unreliable equipment immediately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCleaning and Maintenance\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eUnplug the heater.\u003c\/li\u003e\n\u003cli\u003eAllow it to cool while still submerged.\u003c\/li\u003e\n\u003cli\u003eRemove it carefully from the aquarium.\u003c\/li\u003e\n\u003cli\u003eWipe away algae and mineral buildup with a soft cloth or sponge.\u003c\/li\u003e\n\u003cli\u003eInspect the glass, cord, plug, suction cups, and bracket.\u003c\/li\u003e\n\u003cli\u003eRinse according to the manufacturer’s instructions.\u003c\/li\u003e\n\u003cli\u003eReinstall the heater and allow it to acclimate underwater before reconnecting power.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not use abrasive tools, harsh household cleaners, or chemicals that may damage the heater or contaminate the aquarium.\u003c\/p\u003e\n\u003ch3\u003eElectrical Safety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAlways create a drip loop in the power cord\u003c\/li\u003e\n\u003cli\u003eUse a ground-fault circuit interrupter, or GFCI, protected outlet\u003c\/li\u003e\n\u003cli\u003eKeep plugs and electrical connections dry\u003c\/li\u003e\n\u003cli\u003eDo not handle plugs with wet hands\u003c\/li\u003e\n\u003cli\u003eDo not operate a heater with damaged glass or wiring\u003c\/li\u003e\n\u003cli\u003eDo not pull the heater by its power cord\u003c\/li\u003e\n\u003cli\u003eUnplug all aquarium equipment before placing hands in the water\u003c\/li\u003e\n\u003cli\u003eKeep the heater fully submerged while operating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Aquarium Heater Note\u003c\/h3\u003e\n\u003cp\u003eNo aquarium heater should be considered completely fail-proof. A separate thermometer and regular observation remain essential.\u003c\/p\u003e\n\u003cp\u003eThe aquarium’s actual temperature may differ from the preset value because of heater tolerance, room temperature, circulation, aquarium size, lid coverage, and equipment placement.\u003c\/p\u003e\n\u003cp\u003eThe Scuba Preset maintains approximately 77°F and cannot be adjusted. Do not use it for species or treatment protocols requiring a significantly different temperature.\u003c\/p\u003e\n\u003cp\u003eAlways unplug the heater before water changes, cleaning, or removal from the aquarium.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size aquarium is the SICCE Scuba Preset 50W designed for?\u003c\/strong\u003e\u003cbr\u003eSICCE rates the 50W model for aquariums between approximately 10 and 15 US gallons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature is it preset to?\u003c\/strong\u003e\u003cbr\u003eIt is preset to approximately 77°F, or 25°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow accurate is the preset temperature?\u003c\/strong\u003e\u003cbr\u003eSICCE lists a normal tolerance of approximately ±2°F, or ±1°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I adjust the temperature?\u003c\/strong\u003e\u003cbr\u003eNo. The Scuba Preset is factory set and does not have an adjustable temperature control.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the glass shatterproof?\u003c\/strong\u003e\u003cbr\u003eSICCE describes it as shatter-resistant glass. No glass heater should be considered completely unbreakable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an automatic thermostat?\u003c\/strong\u003e\u003cbr\u003eYes. Its electronic control cycles the heater on and off to maintain the preset temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an indicator light?\u003c\/strong\u003e\u003cbr\u003eYes. The ON\/OFF light indicates when the heater is actively heating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include overheating protection?\u003c\/strong\u003e\u003cbr\u003eYes. SICCE lists a thermal safety shutoff as a feature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the heater need to be fully submerged?\u003c\/strong\u003e\u003cbr\u003eYes. It is designed as a fully submersible aquarium heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be installed horizontally?\u003c\/strong\u003e\u003cbr\u003eIt may be positioned according to the manufacturer’s installation instructions as long as it remains fully submerged and has adequate water circulation around it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in saltwater aquariums?\u003c\/strong\u003e\u003cbr\u003eIt may be used in appropriate aquarium systems when installed and maintained according to SICCE’s instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for planted aquariums?\u003c\/strong\u003e\u003cbr\u003eYes, when the preset temperature is suitable for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for bettas?\u003c\/strong\u003e\u003cbr\u003eIt can be appropriate for bettas in aquariums within the 10–15 gallon recommended capacity, provided approximately 77°F is suitable for the setup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe for shrimp?\u003c\/strong\u003e\u003cbr\u003eIt may be used with shrimp when the species is suited to approximately 77°F. Some shrimp prefer cooler water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I use a separate thermometer?\u003c\/strong\u003e\u003cbr\u003eYes. An independent thermometer is recommended with every aquarium heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long should it sit underwater before being plugged in?\u003c\/strong\u003e\u003cbr\u003eAllow it to acclimate underwater for approximately 15 minutes before connecting power, and follow the included manufacturer instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I unplug it during water changes?\u003c\/strong\u003e\u003cbr\u003eYes. Unplug the heater before lowering the water level and allow it to cool before exposing or removing it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the power cord?\u003c\/strong\u003e\u003cbr\u003eThe 50W Scuba Preset has an approximately 6-foot power cable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the heater be used in an aquarium smaller than 10 gallons?\u003c\/strong\u003e\u003cbr\u003eSICCE officially rates this model for 10–15 gallons. Choose equipment specifically rated for smaller aquariums when heating a tank below that range.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eThe SICCE Scuba Preset 50W Aquarium Heater offers simple, preset electronic heating for 10–15 gallon freshwater and marine aquariums. Its compact design, shatter-resistant glass, indicator light, thermal safety shutoff, and secure suction cups make it a convenient option for small tropical setups.\u003c\/p\u003e\n\u003cp\u003eVisit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop SICCE aquarium heaters, thermometers, filters, circulation pumps, replacement parts, and aquarium temperature-control supplies.\u003c\/p\u003e","brand":"Sicce","offers":[{"title":"Default Title","offer_id":51748787257557,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SI97852-2T.png?v=1785066869"},{"product_id":"sicce-scuba-preset-100w","title":"Sicce Scuba Preset 100W Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eSicce Scuba Preset 100W Aquarium Heater\u003c\/strong\u003e is a durable, fully submersible heater built to keep appropriately sized aquariums at a stable, comfortable temperature. Pre-set to maintain a consistent \u003cstrong\u003e77°F (25°C)\u003c\/strong\u003e, it delivers preset heating when properly sized and monitored for tropical fish, shrimp, and live plants.\u003c\/p\u003e\u003cp\u003eBuilt with \u003cstrong\u003eshatter-resistant glass\u003c\/strong\u003e, thermal overheat protection, and a precision thermostat, the Scuba Preset works dependably in \u003cstrong\u003efreshwater, saltwater, and planted aquariums\u003c\/strong\u003e and installs with the included suction-cup mount.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-set to 77°F (25°C)\u003c\/strong\u003e - ideal range for most tropical tanks, no adjustment needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100W output\u003c\/strong\u003e - sized for aquariums 20–35 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible\u003c\/strong\u003e - mount horizontally or vertically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant construction\u003c\/strong\u003e - durable glass housing for safety and longevity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic thermostat\u003c\/strong\u003e - maintains steady water temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater \u0026amp; saltwater safe\u003c\/strong\u003e - versatile for community, planted, and marine setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sicce\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Scuba Preset 100W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 100 Watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Setting:\u003c\/strong\u003e Pre-set 77°F (25°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Size:\u003c\/strong\u003e 20–35 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e shatter-resistant glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Freshwater or saltwater aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible (horizontal or vertical)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage Tips\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePosition the heater near steady water flow so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eLet the heater sit in the water 10-15 minutes before plugging in to avoid thermal shock.\u003c\/li\u003e\n\u003cli\u003ePair with a separate aquarium thermometer to monitor temperature accuracy.\u003c\/li\u003e\n\u003cli\u003eUnplug and allow the heater to cool before removing it from the tank.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHeater Sizing Guide\u003c\/h3\u003e\u003cp\u003eAs a rule of thumb, choose roughly 3-5 watts per gallon depending on how much warmer your tank needs to be than the room:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e50W - up to ~15 gallons\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e100W - 20–35 gallons\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e150W - 31–45 gallons\u003c\/li\u003e\n\u003cli\u003e200W - 40–60 gallons\u003c\/li\u003e\n\u003cli\u003e250W - 53–75 gallons\u003c\/li\u003e\n\u003cli\u003e300W - 65–90 gallons\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTemperature Accuracy and Safety\u003c\/h3\u003e\u003cp\u003eThis model is factory preset to approximately 77°F (25°C), with a manufacturer-stated tolerance of ±2°F (±1°C). It is not adjustable. Use a separate aquarium thermometer to verify the actual water temperature, and make sure the preset temperature suits the animals in the tank.\u003c\/p\u003e\u003cp\u003eInstall fully submerged with good water circulation, follow the supplied instructions, and arrange the power cord with a drip loop. Unplug before water changes or removal and let the heater cool while still submerged. Never operate an aquarium heater outside water.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I adjust the temperature?\u003c\/strong\u003e\u003cbr\u003eA: No - this model is pre-set to hold 77°F (25°C) automatically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it safe for saltwater tanks?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the Scuba Preset works in both freshwater and marine aquariums.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Does it need to be fully submerged?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it is designed for full submersion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What size tank is best for the 100W model?\u003c\/strong\u003e\u003cbr\u003eA: It works best for aquariums approximately 20–35 gallons.\u003c\/p\u003e","brand":"Sicce","offers":[{"title":"Default Title","offer_id":51748793778389,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SicceHeater100.jpg?v=1756074698"},{"product_id":"sicce-scuba-preset-300w-aquarium-heater","title":"SICCE Scuba Preset 300W Aquarium Heater – 65 to 90 Gallons","description":"\u003cp\u003eThe SICCE Scuba Preset 300W Aquarium Heater is a fully submersible electronic heater designed to maintain a stable temperature in large freshwater and saltwater aquariums. Its factory-preset thermostat maintains approximately 77°F, or 25°C, without requiring manual temperature adjustment.\u003c\/p\u003e\n\u003cp\u003eSICCE rates the 300-watt model for aquariums between approximately 65 and 90 US gallons. It is a convenient option for tropical community tanks, planted aquariums, marine systems, quarantine setups, and other aquariums whose inhabitants are suited to a temperature near 77°F.\u003c\/p\u003e\n\u003cp\u003eThe Scuba Preset features high-thermal-density, shatter-resistant glass, an electronic thermostat, thermal safety shutoff, a visible ON\/OFF indicator light, and strong suction cups for secure installation. Its slim design helps reduce visual impact inside the aquarium while providing dependable everyday temperature control.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset to 77°F:\u003c\/strong\u003e Factory set to approximately 77°F, or 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-Watt Heating Output:\u003c\/strong\u003e Designed for large aquariums between approximately 65 and 90 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Thermostat:\u003c\/strong\u003e Automatically cycles the heater on and off to maintain the preset temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Submersible:\u003c\/strong\u003e Designed to operate completely underwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-Resistant Glass:\u003c\/strong\u003e High-thermal-density glass construction provides durability and efficient heat transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Safety Shutoff:\u003c\/strong\u003e Built-in protection helps reduce the risk of overheating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eON\/OFF Indicator Light:\u003c\/strong\u003e Shows when the heating element is operating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong Suction Cups:\u003c\/strong\u003e Help keep the heater securely positioned inside the aquarium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and Marine Use:\u003c\/strong\u003e Suitable for a variety of aquarium environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlim Profile:\u003c\/strong\u003e Designed to minimize visual impact inside the tank\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e SICCE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Scuba Preset Aquarium Heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Scuba Preset 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 300 watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Aquarium Capacity:\u003c\/strong\u003e 65–90 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric Aquarium Capacity:\u003c\/strong\u003e 250–350 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset Temperature:\u003c\/strong\u003e 77°F \/ 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Tolerance:\u003c\/strong\u003e Approximately ±2°F \/ ±1°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Adjustment:\u003c\/strong\u003e Non-adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e High-thermal-density, shatter-resistant glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat:\u003c\/strong\u003e Electronic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicator:\u003c\/strong\u003e ON\/OFF heating light\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Feature:\u003c\/strong\u003e Thermal safety shutoff\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e Approximately 6 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible with suction-cup mounting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Compatibility:\u003c\/strong\u003e Freshwater and saltwater\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLarge aquariums between approximately 65 and 90 gallons\u003c\/li\u003e\n\u003cli\u003e75-gallon tropical community aquariums\u003c\/li\u003e\n\u003cli\u003eLarge planted aquariums\u003c\/li\u003e\n\u003cli\u003eFreshwater cichlid aquariums when 77°F is appropriate\u003c\/li\u003e\n\u003cli\u003eLarge discus or angelfish systems only when the preset temperature meets their needs\u003c\/li\u003e\n\u003cli\u003eMarine fish aquariums\u003c\/li\u003e\n\u003cli\u003eLarge quarantine or holding systems\u003c\/li\u003e\n\u003cli\u003eAquariums where a simple preset heater is preferred\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePreset Temperature\u003c\/h3\u003e\n\u003cp\u003eThe SICCE Scuba Preset 300W is factory set to approximately 77°F, or 25°C. SICCE lists a normal operating tolerance of approximately ±2°F, or ±1°C.\u003c\/p\u003e\n\u003cp\u003eThe actual temperature may therefore cycle slightly above or below 77°F during normal operation. Room temperature, water circulation, aquarium volume, lid coverage, equipment placement, and thermometer accuracy may also affect the measured temperature.\u003c\/p\u003e\n\u003cp\u003eThis heater is not adjustable. Confirm that approximately 77°F is appropriate for every fish, shrimp, plant, coral, or invertebrate in the aquarium before selecting this model.\u003c\/p\u003e\n\u003ch3\u003eRecommended Aquarium Size\u003c\/h3\u003e\n\u003cp\u003eSICCE rates the Scuba Preset 300W for aquariums between approximately 65 and 90 US gallons, equivalent to approximately 250–350 liters.\u003c\/p\u003e\n\u003cp\u003eThe original estimate of 79 gallons falls within this range, but it understates the manufacturer’s maximum published capacity.\u003c\/p\u003e\n\u003cp\u003eHeater sizing depends on more than aquarium volume. Performance may also be affected by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe difference between room temperature and the desired aquarium temperature\u003c\/li\u003e\n\u003cli\u003eWhether the aquarium has a lid or open top\u003c\/li\u003e\n\u003cli\u003eWater circulation and filter placement\u003c\/li\u003e\n\u003cli\u003eDrafts, exterior walls, and nearby windows\u003c\/li\u003e\n\u003cli\u003eAquarium shape and exposed surface area\u003c\/li\u003e\n\u003cli\u003eWater volume displaced by substrate, rock, and decorations\u003c\/li\u003e\n\u003cli\u003eWhether a sump is included in the total system volume\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA 300W heater may adequately heat a covered 90-gallon aquarium in a warm room but may struggle in a similarly sized open-top aquarium located in a cold area.\u003c\/p\u003e\n\u003ch3\u003eSICCE Scuba Preset Heater Sizing Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50W:\u003c\/strong\u003e 10–15 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100W:\u003c\/strong\u003e 20–35 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150W:\u003c\/strong\u003e 31–45 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e200W:\u003c\/strong\u003e 40–60 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250W:\u003c\/strong\u003e 53–75 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300W:\u003c\/strong\u003e 65–90 US gallons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese are SICCE’s published capacity ranges. Choose the heater size according to the aquarium’s actual conditions rather than relying solely on a general watts-per-gallon rule.\u003c\/p\u003e\n\u003ch3\u003eInstallation Instructions\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInspect the heater, glass body, cord, plug, mounting bracket, and suction cups before installation.\u003c\/li\u003e\n\u003cli\u003eDo not use the heater if the glass, cord, plug, or housing appears damaged.\u003c\/li\u003e\n\u003cli\u003eAttach the supplied suction cups securely.\u003c\/li\u003e\n\u003cli\u003eInstall the heater fully underwater in the aquarium.\u003c\/li\u003e\n\u003cli\u003ePosition it near steady water circulation from a filter return or circulation pump.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to remain submerged and unplugged for approximately 15 minutes before connecting power.\u003c\/li\u003e\n\u003cli\u003eCreate a drip loop in the power cord below the electrical outlet.\u003c\/li\u003e\n\u003cli\u003ePlug the heater into a properly protected outlet.\u003c\/li\u003e\n\u003cli\u003eMonitor the aquarium with a separate thermometer.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eAlways review the included SICCE instructions before installation and use.\u003c\/p\u003e\n\u003ch3\u003eBest Heater Placement\u003c\/h3\u003e\n\u003cp\u003ePosition the heater in an area with consistent water movement so warmed water is distributed throughout the aquarium. Placement near a filter outlet, canister-filter return, internal pump, or circulation pump can help reduce temperature differences between areas of a large tank.\u003c\/p\u003e\n\u003cp\u003eAvoid placing the heater in a stagnant corner or behind dense decorations that prevent water from flowing around the glass body.\u003c\/p\u003e\n\u003cp\u003eDo not bury the heater in substrate or allow it to rest directly against rock, driftwood, decorations, or the aquarium bottom.\u003c\/p\u003e\n\u003ch3\u003eHorizontal or Vertical Installation\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset may be positioned according to the aquarium layout and the manufacturer’s instructions, provided the heater remains fully submerged and water can circulate freely around it.\u003c\/p\u003e\n\u003cp\u003eA horizontal or slightly angled position low in the aquarium may help distribute heat as warmer water rises. Vertical placement may be more convenient in narrow spaces or near a filter intake or return.\u003c\/p\u003e\n\u003cp\u003eSecure both suction cups firmly and inspect them regularly to ensure the heater has not detached from the aquarium wall.\u003c\/p\u003e\n\u003ch3\u003eUsing a Separate Thermometer\u003c\/h3\u003e\n\u003cp\u003eAlways pair the heater with a separate aquarium thermometer. A preset thermostat controls the heater, but an independent thermometer confirms the actual water temperature.\u003c\/p\u003e\n\u003cp\u003ePlace the thermometer away from the heater so it measures the general aquarium temperature rather than the warmer water immediately surrounding the heating element.\u003c\/p\u003e\n\u003cp\u003eIn large aquariums, checking temperature at opposite ends of the tank can help identify insufficient circulation or temperature differences.\u003c\/p\u003e\n\u003ch3\u003eON\/OFF Indicator Light\u003c\/h3\u003e\n\u003cp\u003eThe indicator light shows when the heating element is operating. It will normally turn on when additional heat is needed and switch off when the electronic thermostat reaches the preset temperature.\u003c\/p\u003e\n\u003cp\u003eNormal cycling is expected. The light does not need to stay illuminated continuously for the aquarium to remain warm.\u003c\/p\u003e\n\u003cp\u003eIf the light remains on continuously while the aquarium stays below the expected range, the room may be too cold, circulation may be insufficient, or the heater may be undersized for the total system volume.\u003c\/p\u003e\n\u003ch3\u003eThermal Safety Shutoff\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset includes thermal safety protection designed to reduce the risk of overheating.\u003c\/p\u003e\n\u003cp\u003eThis feature does not replace proper installation and handling. Always operate the heater fully submerged, maintain adequate water circulation, and unplug it before exposing it to air.\u003c\/p\u003e\n\u003cp\u003eNo safety system makes an aquarium heater completely fail-proof. Continue checking temperature regularly with an independent thermometer.\u003c\/p\u003e\n\u003ch3\u003eWater-Change Safety\u003c\/h3\u003e\n\u003cp\u003eUnplug the heater before draining aquarium water. Even a fully submersible heater can overheat or become damaged if it remains powered while exposed to air.\u003c\/p\u003e\n\u003cp\u003eAllow the heater to cool while it is still underwater before removing it or lowering the water below its position.\u003c\/p\u003e\n\u003cp\u003eAfter refilling the aquarium, confirm that the heater is fully submerged and allow it to acclimate for approximately 15 minutes before reconnecting power.\u003c\/p\u003e\n\u003ch3\u003eFreshwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset may be used in freshwater tropical community aquariums, planted systems, cichlid tanks, quarantine setups, and other compatible freshwater environments.\u003c\/p\u003e\n\u003cp\u003eThe heater does not regulate pH, GH, KH, ammonia, nitrite, nitrate, or other water parameters. Continue regular testing and aquarium maintenance.\u003c\/p\u003e\n\u003ch3\u003eSaltwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in appropriately sized saltwater and marine aquariums when approximately 77°F is suitable for the livestock.\u003c\/p\u003e\n\u003cp\u003eRegularly inspect the heater, suction cups, cord, and mounting hardware for salt or mineral buildup. Always disconnect power before cleaning or handling the unit.\u003c\/p\u003e\n\u003cp\u003eMarine aquarium temperature requirements vary by species. Confirm that the preset range is appropriate for the fish, coral, and invertebrates being maintained.\u003c\/p\u003e\n\u003ch3\u003eUse in Planted Aquariums\u003c\/h3\u003e\n\u003cp\u003eThe Scuba Preset 300W may be used in large planted aquariums when approximately 77°F is suitable for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003ePlace the heater where dense plant growth will not block water circulation or prevent routine inspection.\u003c\/p\u003e\n\u003cp\u003eThe heater provides temperature control only and does not supply lighting, carbon dioxide, fertilizer, or plant nutrients.\u003c\/p\u003e\n\u003ch3\u003eUse with Shrimp\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in large shrimp or mixed-community aquariums when the shrimp species is compatible with approximately 77°F.\u003c\/p\u003e\n\u003cp\u003eSome Neocaridina may tolerate this temperature, while many Caridina and cool-water shrimp may do better at lower temperatures. Warmer water also contains less dissolved oxygen.\u003c\/p\u003e\n\u003cp\u003eResearch the requirements of the specific shrimp species and maintain adequate aeration and circulation.\u003c\/p\u003e\n\u003ch3\u003eUse in Cichlid Aquariums\u003c\/h3\u003e\n\u003cp\u003eThe 300W Scuba Preset may be suitable for many African, Central American, and South American cichlid systems within the rated aquarium size, provided approximately 77°F matches the species’ needs.\u003c\/p\u003e\n\u003cp\u003eSome cichlids require warmer or cooler water, especially during breeding or treatment. Select an adjustable heater when a different temperature must be maintained.\u003c\/p\u003e\n\u003ch3\u003eUse in Quarantine or Holding Systems\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in large quarantine, observation, retail, or temporary holding systems when 77°F is suitable for the fish being housed.\u003c\/p\u003e\n\u003cp\u003eBecause it is not adjustable, it may not be appropriate for treatment protocols requiring a specific elevated or reduced temperature.\u003c\/p\u003e\n\u003cp\u003eDisinfect equipment carefully between uses and inspect the glass and cord before reinstalling the heater.\u003c\/p\u003e\n\u003ch3\u003eOne Large Heater vs. Two Smaller Heaters\u003c\/h3\u003e\n\u003cp\u003eFor some large aquariums, using two smaller heaters may provide more even heat distribution and limited redundancy if one heater stops working.\u003c\/p\u003e\n\u003cp\u003eFor example, a system that requires approximately 300 watts of heating may sometimes be operated with two appropriately sized heaters placed at opposite ends of the aquarium. The combined wattage must still be appropriate for the aquarium and room conditions.\u003c\/p\u003e\n\u003cp\u003eUsing two heaters does not eliminate the need for a thermometer, regular inspection, or safe electrical installation.\u003c\/p\u003e\n\u003ch3\u003ePreset vs. Adjustable Aquarium Heaters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreset Heater:\u003c\/strong\u003e Simple plug-and-play operation with no temperature dial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Heater:\u003c\/strong\u003e Allows the aquarium owner to select a species-specific or treatment-specific temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Scuba Preset is a good choice when approximately 77°F is appropriate and simple operation is preferred.\u003c\/p\u003e\n\u003cp\u003eChoose an adjustable model when keeping fish that require a different temperature, conditioning fish for breeding, or following a treatment protocol that requires precise temperature control.\u003c\/p\u003e\n\u003ch3\u003eTemperature Monitoring Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the aquarium thermometer daily\u003c\/li\u003e\n\u003cli\u003ePlace the thermometer away from the heater\u003c\/li\u003e\n\u003cli\u003eCheck both ends of large aquariums\u003c\/li\u003e\n\u003cli\u003eWatch for seasonal changes in room temperature\u003c\/li\u003e\n\u003cli\u003eMaintain steady water circulation\u003c\/li\u003e\n\u003cli\u003eInspect the heater after power outages\u003c\/li\u003e\n\u003cli\u003eReplace damaged or unreliable equipment immediately\u003c\/li\u003e\n\u003cli\u003eConsider a temperature alarm or controller for valuable livestock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCleaning and Maintenance\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eUnplug the heater.\u003c\/li\u003e\n\u003cli\u003eAllow it to cool while still submerged.\u003c\/li\u003e\n\u003cli\u003eRemove the heater carefully.\u003c\/li\u003e\n\u003cli\u003eClean algae and mineral deposits with a soft cloth or sponge.\u003c\/li\u003e\n\u003cli\u003eInspect the glass, cord, plug, suction cups, and mounting bracket.\u003c\/li\u003e\n\u003cli\u003eRinse according to the manufacturer’s instructions.\u003c\/li\u003e\n\u003cli\u003eReinstall the heater fully underwater.\u003c\/li\u003e\n\u003cli\u003eAllow it to acclimate before reconnecting power.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not use abrasive scrapers, harsh household cleaners, or chemicals that could damage the glass or contaminate the aquarium.\u003c\/p\u003e\n\u003ch3\u003eElectrical Safety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCreate a drip loop below the electrical outlet\u003c\/li\u003e\n\u003cli\u003eUse a GFCI-protected outlet whenever possible\u003c\/li\u003e\n\u003cli\u003eKeep the plug and electrical connection dry\u003c\/li\u003e\n\u003cli\u003eDo not handle the plug with wet hands\u003c\/li\u003e\n\u003cli\u003eUnplug aquarium equipment before placing hands in the water\u003c\/li\u003e\n\u003cli\u003eDo not use a heater with cracked glass or a damaged cord\u003c\/li\u003e\n\u003cli\u003eNever pull or carry the heater by its power cord\u003c\/li\u003e\n\u003cli\u003eDo not cut, splice, or attempt to repair the electrical cord\u003c\/li\u003e\n\u003cli\u003eOperate the heater only while properly submerged\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Aquarium Heater Note\u003c\/h3\u003e\n\u003cp\u003eThe SICCE Scuba Preset 300W is rated for aquariums between approximately 65 and 90 gallons, but actual heating performance depends on room conditions and total system volume.\u003c\/p\u003e\n\u003cp\u003eThe heater is preset to approximately 77°F with a stated tolerance of ±2°F and cannot be manually adjusted.\u003c\/p\u003e\n\u003cp\u003eNo aquarium heater should be considered completely fail-proof. Use a separate thermometer, inspect the heater regularly, and unplug it before water changes or removal.\u003c\/p\u003e\n\u003cp\u003eDo not use this heater for livestock requiring a temperature substantially different from its preset operating range.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size aquarium is the SICCE Scuba Preset 300W designed for?\u003c\/strong\u003e\u003cbr\u003eSICCE rates the 300W model for aquariums between approximately 65 and 90 US gallons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it only rated for tanks up to 79 gallons?\u003c\/strong\u003e\u003cbr\u003eNo. SICCE’s current published range extends up to approximately 90 gallons, depending on aquarium and room conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature is it preset to?\u003c\/strong\u003e\u003cbr\u003eIt is factory preset to approximately 77°F, or 25°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow accurate is the preset thermostat?\u003c\/strong\u003e\u003cbr\u003eSICCE lists a normal tolerance of approximately ±2°F, or ±1°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the temperature be adjusted?\u003c\/strong\u003e\u003cbr\u003eNo. This is a non-adjustable preset heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the glass shatterproof?\u003c\/strong\u003e\u003cbr\u003eNo glass heater should be described as completely shatterproof. SICCE describes it as high-thermal-density, shatter-resistant glass.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an electronic thermostat?\u003c\/strong\u003e\u003cbr\u003eYes. The heater automatically cycles on and off to maintain the preset temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an indicator light?\u003c\/strong\u003e\u003cbr\u003eYes. The ON\/OFF light shows when the heater is actively heating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include overheat protection?\u003c\/strong\u003e\u003cbr\u003eYes. SICCE lists a thermal safety shutoff as a feature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the heater need to be fully submerged?\u003c\/strong\u003e\u003cbr\u003eYes. It is designed as a fully submersible aquarium heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be mounted horizontally?\u003c\/strong\u003e\u003cbr\u003eIt may be positioned according to the manufacturer’s instructions as long as it remains fully submerged and water circulates freely around it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in freshwater aquariums?\u003c\/strong\u003e\u003cbr\u003eYes. It may be used in appropriate freshwater systems within its size and temperature range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in saltwater aquariums?\u003c\/strong\u003e\u003cbr\u003eYes. It may be used in appropriately sized marine systems when approximately 77°F is suitable for the livestock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for planted tanks?\u003c\/strong\u003e\u003cbr\u003eYes, provided the preset temperature is suitable for the plants and animals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe for shrimp?\u003c\/strong\u003e\u003cbr\u003eIt may be used with shrimp species that tolerate approximately 77°F. Some shrimp prefer cooler water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I use a separate thermometer?\u003c\/strong\u003e\u003cbr\u003eYes. A separate thermometer is recommended with every aquarium heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould the heater be unplugged during water changes?\u003c\/strong\u003e\u003cbr\u003eYes. Unplug it before lowering the water level, cleaning the aquarium, or removing the heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long should it sit underwater before being plugged in?\u003c\/strong\u003e\u003cbr\u003eAllow it to acclimate underwater for approximately 15 minutes and follow the included SICCE instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the power cable?\u003c\/strong\u003e\u003cbr\u003eSICCE lists an approximately 6-foot cable for the Scuba Preset series.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWould two smaller heaters be better in a large aquarium?\u003c\/strong\u003e\u003cbr\u003eTwo properly sized heaters may provide more even heat distribution and some limited redundancy, but the correct arrangement depends on the aquarium’s volume, circulation, and room temperature.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eThe SICCE Scuba Preset 300W Aquarium Heater provides straightforward electronic temperature control for freshwater and saltwater aquariums between approximately 65 and 90 gallons. It is preset to 77°F and features shatter-resistant glass, an ON\/OFF indicator light, thermal safety shutoff, and strong suction-cup mounting.\u003c\/p\u003e\n\u003cp\u003eVisit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop SICCE aquarium heaters, thermometers, temperature controllers, filters, circulation pumps, replacement parts, and aquarium temperature-control supplies.\u003c\/p\u003e","brand":"Sicce","offers":[{"title":"Default Title","offer_id":51748794335445,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SI97862-2T.jpg?v=1785067426"},{"product_id":"sicce-scuba-preset-aquarium-heater-150w","title":"Sicce Scuba Preset 150W Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eSicce Scuba Preset 150W Aquarium Heater\u003c\/strong\u003e is a durable, fully submersible heater that keeps small-to-medium aquariums at a stable, comfortable temperature. Pre-set to maintain a consistent \u003cstrong\u003e77°F (25°C)\u003c\/strong\u003e, it delivers preset heating when properly sized and monitored for tropical fish, shrimp, and live plants.\u003c\/p\u003e\u003cp\u003eBuilt with \u003cstrong\u003eshatter-resistant glass\u003c\/strong\u003e, thermal overheat protection, and a precision thermostat, the Scuba Preset works dependably in \u003cstrong\u003efreshwater, saltwater, and planted aquariums\u003c\/strong\u003e and installs with the included suction-cup mount.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-set to 77°F (25°C)\u003c\/strong\u003e - ideal range for most tropical tanks, no adjustment needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150W output\u003c\/strong\u003e - sized for aquariums 31–45 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible\u003c\/strong\u003e - mount horizontally or vertically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant construction\u003c\/strong\u003e - durable glass housing for safety and longevity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic thermostat\u003c\/strong\u003e - maintains steady water temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater \u0026amp; saltwater safe\u003c\/strong\u003e - versatile for community, planted, and marine setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sicce\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Scuba Preset 150W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 150 Watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Setting:\u003c\/strong\u003e Pre-set 77°F (25°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Size:\u003c\/strong\u003e 31–45 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e shatter-resistant glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Freshwater or saltwater aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible (horizontal or vertical)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage Tips\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePosition the heater near steady water flow so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eLet the heater sit in the water 10-15 minutes before plugging in to avoid thermal shock.\u003c\/li\u003e\n\u003cli\u003ePair with a separate aquarium thermometer to monitor temperature accuracy.\u003c\/li\u003e\n\u003cli\u003eUnplug and allow the heater to cool before removing it from the tank.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHeater Sizing Guide\u003c\/h3\u003e\u003cp\u003eAs a rule of thumb, choose roughly 3-5 watts per gallon depending on how much warmer your tank needs to be than the room:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e50W - up to ~15 gallons\u003c\/li\u003e\n\u003cli\u003e100W - 20–35 gallons\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e150W - 31–45 gallons\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e200W - 40–60 gallons\u003c\/li\u003e\n\u003cli\u003e250W - 53–75 gallons\u003c\/li\u003e\n\u003cli\u003e300W - 65–90 gallons\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTemperature Accuracy and Safety\u003c\/h3\u003e\u003cp\u003eThis model is factory preset to approximately 77°F (25°C), with a manufacturer-stated tolerance of ±2°F (±1°C). It is not adjustable. Use a separate aquarium thermometer to verify the actual water temperature, and make sure the preset temperature suits the animals in the tank.\u003c\/p\u003e\u003cp\u003eInstall fully submerged with good water circulation, follow the supplied instructions, and arrange the power cord with a drip loop. Unplug before water changes or removal and let the heater cool while still submerged. Never operate an aquarium heater outside water.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I adjust the temperature?\u003c\/strong\u003e\u003cbr\u003eA: No - this model is pre-set to hold 77°F (25°C) automatically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it safe for saltwater tanks?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the Scuba Preset works in both freshwater and marine aquariums.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Does it need to be fully submerged?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it is designed for full submersion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What size tank is best for the 150W model?\u003c\/strong\u003e\u003cbr\u003eA: It works best for aquariums approximately 31–45 gallons.\u003c\/p\u003e","brand":"Sicce","offers":[{"title":"Default Title","offer_id":51805497458901,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SicceHeater150.jpg?v=1756075063"},{"product_id":"eheim-jager-25w-submersible-heater","title":"Eheim Jager 25W Submersible Heater","description":"\u003cp\u003eSmall tank, big reliability. The \u003cstrong\u003eEheim Jager 25W Submersible Aquarium Heater\u003c\/strong\u003e brings the legendary German-engineered precision of the Jager line to nano and desktop aquariums. Its adjustable thermostat helps maintain the selected temperature when appropriately sized and monitored so your fish, shrimp, and plants stay comfortable — all from a compact, shatter-resistant glass construction you can fully submerge.\u003c\/p\u003e\n\u003cp\u003eThe 25W is a great fit for small setups; as a general guideline, figure roughly 5 watts per gallon for a 5–7 gallon tank in a normal room.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25 watts of reliable heat:\u003c\/strong\u003e Ideal for small nano and desktop aquariums (~5–7 gallons)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Stepping up a size? Check the \u003ca href=\"\/products\/eheim-jager-50w-aquarium-heater-fully-submersible\"\u003e50W\u003c\/a\u003e and \u003ca href=\"\/products\/eheim-jager-75w-submersible-aquarium-heater\"\u003e75W\u003c\/a\u003e Jager heaters. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eHeater Installation and Safety\u003c\/h3\u003e\u003cp\u003eUse a separate aquarium thermometer to check actual water temperature. Follow the manufacturer's minimum-water-level and mounting instructions. Unplug the heater before water changes or removal, and allow it to cool in water before handling. Do not operate it outside the water unless the manufacturer expressly permits that use. Keep the heater where water can circulate around it, and make a drip loop in the power cord.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":51827938164949,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/141105121153__74745.jpg?v=1756075225"},{"product_id":"hygger-hg031-mini-pro-aquarium-heater-50w","title":"Hygger HG031 Mini Pro Aquarium Heater 50W","description":"\u003cp data-start=\"558\" data-end=\"985\"\u003eThe \u003cstrong data-start=\"589\" data-end=\"636\"\u003eHygger HG031 Mini Pro Aquarium Heater 50W\u003c\/strong\u003e is a compact and efficient heater designed for small and nano aquariums. With precise temperature control and a built-in thermostat, it maintains stable water conditions for tropical fish and shrimp. The durable quartz heating element and fully submersible design are designed for submerged heating when installed according to manufacturer instructions. Ideal for aquariums 8–16 gallons.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"989\" data-end=\"1034\"\u003eCompact 50W heater for small and nano tanks\u003c\/li\u003e\n\u003cli data-start=\"1037\" data-end=\"1093\"\u003eBuilt-in thermostat for precise temperature regulation\u003c\/li\u003e\n\u003cli data-start=\"1096\" data-end=\"1135\"\u003eFully submersible and easy to install\u003c\/li\u003e\n\u003cli data-start=\"1138\" data-end=\"1180\"\u003eDurable, shatter-resistant quartz design\u003c\/li\u003e\n\u003cli data-start=\"1183\" data-end=\"1219\"\u003eLED indicator shows heating status\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1221\" data-end=\"1242\"\u003e\u003cstrong data-start=\"1221\" data-end=\"1240\"\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1245\" data-end=\"1286\"\u003e\n\u003cstrong data-start=\"1245\" data-end=\"1255\"\u003eModel:\u003c\/strong\u003e Hygger HG031 Mini Pro Heater\u003c\/li\u003e\n\u003cli data-start=\"1289\" data-end=\"1305\"\u003e\n\u003cstrong data-start=\"1289\" data-end=\"1299\"\u003ePower:\u003c\/strong\u003e 50W\u003c\/li\u003e\n\u003cli data-start=\"1308\" data-end=\"1361\"\u003e\n\u003cstrong data-start=\"1308\" data-end=\"1322\"\u003eTank Size:\u003c\/strong\u003e Ideal for aquariums 8–16 gallons\u003c\/li\u003e\n\u003cli data-start=\"1364\" data-end=\"1406\"\u003e\n\u003cstrong data-start=\"1364\" data-end=\"1386\"\u003eTemperature Range:\u003c\/strong\u003e 59–93°F (15–34°C)\u003c\/li\u003e\n\u003cli data-start=\"1409\" data-end=\"1445\"\u003e\n\u003cstrong data-start=\"1409\" data-end=\"1418\"\u003eType:\u003c\/strong\u003e Fully submersible heater\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1447\" data-end=\"1606\"\u003e\u003cstrong data-start=\"1447\" data-end=\"1456\"\u003eFAQs:\u003c\/strong\u003e\u003cbr data-start=\"1456\" data-end=\"1459\"\u003e\u003cstrong data-start=\"1459\" data-end=\"1515\"\u003eQ: Can this heater be used in shrimp or betta tanks?\u003c\/strong\u003e\u003cbr data-start=\"1515\" data-end=\"1518\"\u003eA: Yes, it may suit shrimp, bettas, and other tropical fish in smaller aquariums.\u003c\/p\u003e\n\u003cp data-start=\"1608\" data-end=\"1758\"\u003e\u003cstrong data-start=\"1608\" data-end=\"1674\"\u003eQ: Does it automatically turn off when it reaches temperature?\u003c\/strong\u003e\u003cbr data-start=\"1674\" data-end=\"1677\"\u003eA: Yes, the built-in thermostat shuts off automatically to prevent overheating.\u003c\/p\u003e\n\u003cp data-start=\"1760\" data-end=\"1886\"\u003e\u003cstrong data-start=\"1760\" data-end=\"1795\"\u003eQ: Can it be used horizontally?\u003c\/strong\u003e\u003cbr data-start=\"1795\" data-end=\"1798\"\u003eA: Yes, its fully submersible and can be installed either vertically or horizontally.\u003c\/p\u003e\u003ch3\u003eHeater Installation and Safety\u003c\/h3\u003e\u003cp\u003eUse a separate aquarium thermometer to check actual water temperature. Follow the manufacturer's minimum-water-level and mounting instructions. Unplug the heater before water changes or removal, and allow it to cool in water before handling. Do not operate it outside the water unless the manufacturer expressly permits that use. Keep the heater where water can circulate around it, and make a drip loop in the power cord.\u003c\/p\u003e","brand":"Hygger","offers":[{"title":"Default Title","offer_id":51870623269077,"sku":null,"price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/hygger-HG031-Mini-Heater-PRODUCT.webp?v=1756075260"},{"product_id":"eheim-jager-150w-aquarium-heater","title":"Eheim Jager 150W Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 150W Aquarium Heater\u003c\/strong\u003e delivers steady, precise warmth for mid-to-large aquariums in the 53–79 gallon range. With its adjustable TruTemp dial, durable shatter-resistant glass, and Thermo Safety Control, it's a dependable choice for keeping tropical fish and plants thriving — fully submersible, freshwater or marine.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 watts of reliable heat:\u003c\/strong\u003e Ideal for aquariums around 53–79 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Sizing up or down? Compare the \u003ca href=\"\/products\/eheim-jager-125w-aquarium-heater-fully-submersible\"\u003e125W\u003c\/a\u003e and \u003ca href=\"\/products\/eheim-jager-200w-submersible-aquarium-heater\"\u003e200W\u003c\/a\u003e Jager heaters. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52013873332437,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/14110501114301942_1280x1280_fa76936d-be10-4c92-b8a7-1b9c9603ea7e.jpg?v=1757898285"},{"product_id":"eheim-jager-50w-aquarium-heater-fully-submersible","title":"Eheim Jager 50W Aquarium Heater Fully Submersible","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 50W Aquarium Heater\u003c\/strong\u003e delivers precise, dependable warmth for small aquariums of 7–16 gallons. Fully submersible and built from shatter-resistant glass, it pairs the famous Jager TruTemp dial with automatic dry-run protection — so your tank stays at the perfect temperature when appropriately installed and monitored.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 watts of reliable heat:\u003c\/strong\u003e Sized for small aquariums of 7–16 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to acclimate in aquarium water before switching it on, following the EHEIM instructions. Unplug it before water changes or removal and allow it to cool while submerged.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Have a slightly bigger tank? See the \u003ca href=\"\/products\/eheim-jager-75w-submersible-aquarium-heater\"\u003e75W\u003c\/a\u003e or \u003ca href=\"\/products\/eheim-jager-100w-submersible-aquarium-heater\"\u003e100W\u003c\/a\u003e. Smaller nano? Try the \u003ca href=\"\/products\/eheim-jager-25w-submersible-heater\"\u003e25W\u003c\/a\u003e. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52013976420565,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/EHM36134-2T.jpg?v=1758893057"},{"product_id":"eheim-thermocontrol-jager-125w-aquarium-heater","title":"EHEIM thermocontrol 125W Adjustable Aquarium Heater – 40 to 53 Gallons","description":"\u003cp\u003eThe EHEIM thermocontrol 125W Aquarium Heater, historically known as the EHEIM Jäger 125W, provides adjustable and precise temperature control for medium-sized freshwater and saltwater aquariums. EHEIM rates this model for aquariums from approximately 150 to 200 liters, equivalent to about 40 to 53 US gallons.\u003c\/p\u003e\n\u003cp\u003eThe temperature can be adjusted from approximately 65°F to 93°F, or 18°C to 34°C, allowing the heater to support a wide range of tropical freshwater fish, marine fish, planted aquariums, quarantine systems, and other temperature-sensitive setups.\u003c\/p\u003e\n\u003cp\u003eA special laboratory-glass jacket increases the heating surface and helps distribute heat evenly. The heater is completely submersible, includes automatic dry-run protection, and uses a visible control lamp to indicate when the heating element is operating.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e125-Watt Heating Output:\u003c\/strong\u003e Designed for aquariums from approximately 40 to 53 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Temperature:\u003c\/strong\u003e Select temperatures from approximately 65°F to 93°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecalibratable Dial:\u003c\/strong\u003e Temperature scale can be corrected by approximately ±3.6°F when necessary\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Temperature Control:\u003c\/strong\u003e Manufacturer-listed control accuracy of approximately ±0.9°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Submersible:\u003c\/strong\u003e Watertight construction allows complete underwater installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Dry-Run Shutoff:\u003c\/strong\u003e Thermo Safety Control helps protect the heater if it is operated outside the water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial Laboratory Glass:\u003c\/strong\u003e Designed for efficient and even heat transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Indicator:\u003c\/strong\u003e Control lamp shows when the heater is actively heating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Suction-Cup Holder:\u003c\/strong\u003e Helps secure the heater to the aquarium wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and Marine Compatible:\u003c\/strong\u003e Suitable for both freshwater and saltwater aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in Germany:\u003c\/strong\u003e Manufactured according to EHEIM’s aquarium-equipment standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e EHEIM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Product Name:\u003c\/strong\u003e thermocontrol 125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormer\/Common Name:\u003c\/strong\u003e EHEIM Jäger 125W Heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 3615010\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWattage:\u003c\/strong\u003e 125 watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Aquarium Volume:\u003c\/strong\u003e 150–200 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximate US Aquarium Volume:\u003c\/strong\u003e 40–53 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 65–93°F \/ 18–34°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Control Accuracy:\u003c\/strong\u003e Approximately ±0.9°F \/ ±0.5°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration Adjustment:\u003c\/strong\u003e Approximately ±3.6°F \/ ±2°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater Diameter:\u003c\/strong\u003e Approximately 36 mm \/ 1.4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater Length:\u003c\/strong\u003e Approximately 319 mm \/ 12.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e Approximately 170 cm \/ 5.6 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Compatibility:\u003c\/strong\u003e Freshwater and saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Guarantee:\u003c\/strong\u003e Three years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAquariums between approximately 40 and 53 gallons\u003c\/li\u003e\n\u003cli\u003e40-gallon breeder aquariums\u003c\/li\u003e\n\u003cli\u003eFreshwater tropical community tanks\u003c\/li\u003e\n\u003cli\u003ePlanted aquariums\u003c\/li\u003e\n\u003cli\u003eAfrican and South American cichlid aquariums\u003c\/li\u003e\n\u003cli\u003eMarine fish aquariums\u003c\/li\u003e\n\u003cli\u003eQuarantine and hospital aquariums\u003c\/li\u003e\n\u003cli\u003eBreeding and conditioning systems\u003c\/li\u003e\n\u003cli\u003eAquariums requiring an adjustable temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAdjustable Temperature Range\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 125 can be adjusted from approximately 65°F to 93°F, or 18°C to 34°C.\u003c\/p\u003e\n\u003cp\u003eThis broad range allows the heater to be matched to the needs of different aquarium inhabitants. The correct temperature should always be selected according to the fish, shrimp, plants, corals, or other animals being maintained.\u003c\/p\u003e\n\u003cp\u003eDo not increase aquarium temperature solely because a heater can reach a higher setting. Excessively warm water holds less dissolved oxygen and may increase stress, metabolism, and disease progression.\u003c\/p\u003e\n\u003ch3\u003eTemperature Calibration\u003c\/h3\u003e\n\u003cp\u003eThe heater includes a recalibratable temperature scale. This allows the displayed setting to be corrected if the aquarium thermometer consistently shows a small difference from the selected temperature.\u003c\/p\u003e\n\u003cp\u003eEHEIM allows calibration adjustment of approximately ±2°C, equivalent to about ±3.6°F.\u003c\/p\u003e\n\u003cp\u003eBefore recalibrating:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eAllow the aquarium temperature to stabilize for at least 24 hours.\u003c\/li\u003e\n\u003cli\u003eUse a reliable independent aquarium thermometer.\u003c\/li\u003e\n\u003cli\u003ePlace the thermometer away from the heater.\u003c\/li\u003e\n\u003cli\u003eConfirm that water circulation is adequate.\u003c\/li\u003e\n\u003cli\u003eCompare the actual temperature with the heater setting.\u003c\/li\u003e\n\u003cli\u003eFollow the included EHEIM instructions to correct the dial.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not recalibrate the heater based on a single reading immediately after installation or a water change.\u003c\/p\u003e\n\u003ch3\u003eTemperature Control Accuracy\u003c\/h3\u003e\n\u003cp\u003eEHEIM lists a temperature-control accuracy of approximately ±0.5°C, equivalent to approximately ±0.9°F.\u003c\/p\u003e\n\u003cp\u003eThis does not mean that every area of the aquarium will remain at exactly the same temperature. Actual readings can be influenced by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWater circulation\u003c\/li\u003e\n\u003cli\u003eRoom temperature\u003c\/li\u003e\n\u003cli\u003eAquarium size and shape\u003c\/li\u003e\n\u003cli\u003eOpen-top or covered construction\u003c\/li\u003e\n\u003cli\u003eHeater placement\u003c\/li\u003e\n\u003cli\u003eFilter and pump operation\u003c\/li\u003e\n\u003cli\u003eAccuracy of the separate thermometer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck more than one area of the aquarium if a noticeable temperature difference develops between opposite ends of the tank.\u003c\/p\u003e\n\u003ch3\u003eRecommended Aquarium Size\u003c\/h3\u003e\n\u003cp\u003eEHEIM rates the thermocontrol 125 for aquariums of approximately 150 liters and up to about 200 liters. This equals approximately 40–53 US gallons.\u003c\/p\u003e\n\u003cp\u003eThe correct heater wattage depends on more than gallon capacity. Consider:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe difference between room temperature and desired water temperature\u003c\/li\u003e\n\u003cli\u003eWhether the aquarium has a lid\u003c\/li\u003e\n\u003cli\u003eCold drafts and exterior walls\u003c\/li\u003e\n\u003cli\u003eOpen-top evaporation\u003c\/li\u003e\n\u003cli\u003eWater circulation\u003c\/li\u003e\n\u003cli\u003eAdditional water in a sump\u003c\/li\u003e\n\u003cli\u003eThe aquarium’s exposed surface area\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA 125W heater may be appropriate for a covered 50-gallon aquarium in a warm room but may not provide enough heat for the same aquarium in a cold basement.\u003c\/p\u003e\n\u003ch3\u003eEHEIM thermocontrol Heater Sizing Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25W:\u003c\/strong\u003e Approximately 5–7 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50W:\u003c\/strong\u003e Approximately 7–16 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75W:\u003c\/strong\u003e Approximately 16–26 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100W:\u003c\/strong\u003e Approximately 26–40 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e125W:\u003c\/strong\u003e Approximately 40–53 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150W:\u003c\/strong\u003e Approximately 53–79 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e200W:\u003c\/strong\u003e Approximately 79–106 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250W:\u003c\/strong\u003e Approximately 106–159 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300W:\u003c\/strong\u003e Approximately 159–264 gallons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese conversions are based on EHEIM’s published liter ranges. Room conditions may require choosing a different wattage or using more than one heater.\u003c\/p\u003e\n\u003ch3\u003eSpecial Laboratory-Glass Construction\u003c\/h3\u003e\n\u003cp\u003eThe heater jacket is made from special laboratory glass designed to resist chemical and biological substances in aquarium water.\u003c\/p\u003e\n\u003cp\u003eAccording to EHEIM, the glass jacket:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases the effective heating surface\u003c\/li\u003e\n\u003cli\u003eHelps distribute heat evenly\u003c\/li\u003e\n\u003cli\u003eActs as a heat shield around the internal heating element\u003c\/li\u003e\n\u003cli\u003eResists normal temperature fluctuations associated with aquarium use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe glass should not be described as completely shatterproof. Inspect the heater before every installation and discontinue use if the glass is cracked, chipped, or damaged.\u003c\/p\u003e\n\u003ch3\u003eThermo Safety Control\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol includes automatic dry-run shutoff, known as Thermo Safety Control.\u003c\/p\u003e\n\u003cp\u003eThis feature is intended to switch the heater off if it is accidentally operated outside the water. It helps reduce the risk of overheating and damage but should not replace proper aquarium-heater handling.\u003c\/p\u003e\n\u003cp\u003eAlways unplug the heater before:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLowering the water level\u003c\/li\u003e\n\u003cli\u003ePerforming a water change\u003c\/li\u003e\n\u003cli\u003eRemoving the heater\u003c\/li\u003e\n\u003cli\u003eCleaning the aquarium\u003c\/li\u003e\n\u003cli\u003ePlacing hands in the water\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHeating Indicator Light\u003c\/h3\u003e\n\u003cp\u003eThe control lamp indicates when the heater is actively producing heat. It normally switches on when the aquarium temperature falls below the selected setting and turns off once the thermostat reaches the target.\u003c\/p\u003e\n\u003cp\u003eNormal cycling is expected. The light does not need to remain illuminated continuously for the heater to maintain temperature.\u003c\/p\u003e\n\u003cp\u003eIf the indicator remains on continuously while the water stays below the selected temperature, the heater may be undersized, improperly positioned, or affected by unusually cold room conditions.\u003c\/p\u003e\n\u003ch3\u003eInstallation Instructions\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInspect the heater, glass tube, cord, plug, holder, and suction cups.\u003c\/li\u003e\n\u003cli\u003eDo not use the heater if any part appears damaged.\u003c\/li\u003e\n\u003cli\u003eAttach the double suction-cup holder.\u003c\/li\u003e\n\u003cli\u003ePosition the heater fully underwater.\u003c\/li\u003e\n\u003cli\u003eInstall it where steady water circulation can distribute heat.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to acclimate to the aquarium water before plugging it in.\u003c\/li\u003e\n\u003cli\u003eCreate a drip loop in the electrical cord below the outlet.\u003c\/li\u003e\n\u003cli\u003eSelect the desired temperature.\u003c\/li\u003e\n\u003cli\u003eConnect the heater to power.\u003c\/li\u003e\n\u003cli\u003eVerify the actual temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eRead and follow the complete EHEIM operating manual supplied with the heater.\u003c\/p\u003e\n\u003ch3\u003eHorizontal or Vertical Installation\u003c\/h3\u003e\n\u003cp\u003eThe thermocontrol heater may be installed according to the aquarium layout as long as it remains fully submerged and water can circulate freely around the glass jacket.\u003c\/p\u003e\n\u003cp\u003eHorizontal or angled placement low in the aquarium can help distribute heat as warmer water rises. Vertical placement may be more convenient beside a filter intake or return.\u003c\/p\u003e\n\u003cp\u003eDo not bury the heater in substrate or allow it to rest directly against rocks, wood, decorations, or the aquarium bottom.\u003c\/p\u003e\n\u003ch3\u003eBest Heater Placement\u003c\/h3\u003e\n\u003cp\u003ePlace the heater near a canister-filter return, hang-on-back filter output, internal filter, or circulation pump. Moving water carries heat throughout the aquarium and helps prevent warm and cool zones.\u003c\/p\u003e\n\u003cp\u003eAvoid placing the heater:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIn a stagnant corner\u003c\/li\u003e\n\u003cli\u003eBehind solid decorations that block flow\u003c\/li\u003e\n\u003cli\u003eDirectly beneath loose rocks\u003c\/li\u003e\n\u003cli\u003eWhere fish can wedge it against the aquarium wall\u003c\/li\u003e\n\u003cli\u003eWhere the water level may fall below it during maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUsing a Separate Thermometer\u003c\/h3\u003e\n\u003cp\u003eAlways use a separate aquarium thermometer with the EHEIM thermocontrol heater.\u003c\/p\u003e\n\u003cp\u003eThe thermometer should be positioned away from the heater so it measures the general aquarium temperature rather than the warmer water surrounding the heating element.\u003c\/p\u003e\n\u003cp\u003eA separate thermometer helps identify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncorrect dial settings\u003c\/li\u003e\n\u003cli\u003eCalibration differences\u003c\/li\u003e\n\u003cli\u003eInsufficient heater wattage\u003c\/li\u003e\n\u003cli\u003ePoor water circulation\u003c\/li\u003e\n\u003cli\u003eEquipment failure\u003c\/li\u003e\n\u003cli\u003eUnexpected seasonal temperature changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWater-Change Safety\u003c\/h3\u003e\n\u003cp\u003eUnplug the heater before lowering the aquarium water level. Allow the heater to cool while it remains submerged before removing it or exposing the glass to air.\u003c\/p\u003e\n\u003cp\u003eAfter refilling the aquarium, confirm that the heater is fully submerged and allow the glass to acclimate to the new water temperature before reconnecting power.\u003c\/p\u003e\n\u003cp\u003eAvoid pouring significantly colder replacement water directly onto a hot heater.\u003c\/p\u003e\n\u003ch3\u003eFreshwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 125 is suitable for freshwater tropical community tanks, planted aquariums, cichlid systems, quarantine tanks, and breeding setups within its recommended volume range.\u003c\/p\u003e\n\u003cp\u003eThe adjustable thermostat allows customers to select a temperature appropriate for the particular freshwater species rather than relying on a fixed preset value.\u003c\/p\u003e\n\u003ch3\u003eSaltwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eEHEIM approves the thermocontrol heater for marine and saltwater aquarium use.\u003c\/p\u003e\n\u003cp\u003eInspect the heater, holder, suction cups, and cord regularly for salt creep and mineral accumulation. Disconnect the heater from power before cleaning.\u003c\/p\u003e\n\u003cp\u003eFor valuable marine systems, consider pairing the heater with an independent temperature controller or alarm for additional monitoring.\u003c\/p\u003e\n\u003ch3\u003eUse in Planted Aquariums\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in planted aquariums when its wattage and selected temperature are suitable for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003ePosition the heater where dense plant growth will not restrict circulation or conceal the heater during inspection.\u003c\/p\u003e\n\u003cp\u003eThe heater controls temperature only. It does not supply light, carbon dioxide, fertilizer, or minerals.\u003c\/p\u003e\n\u003ch3\u003eUse with Shrimp\u003c\/h3\u003e\n\u003cp\u003eThe adjustable temperature range allows the thermocontrol 125 to be used in appropriately sized shrimp aquariums, provided the selected temperature matches the species.\u003c\/p\u003e\n\u003cp\u003eSome Neocaridina shrimp tolerate warmer tropical temperatures, while many Caridina species perform better at cooler temperatures. Warmer water also contains less dissolved oxygen.\u003c\/p\u003e\n\u003cp\u003eResearch the specific shrimp species and monitor the aquarium with an independent thermometer.\u003c\/p\u003e\n\u003ch3\u003eUse in Quarantine and Hospital Tanks\u003c\/h3\u003e\n\u003cp\u003eThe adjustable temperature dial can be useful in quarantine and observation systems where the temperature must be matched to a particular fish species.\u003c\/p\u003e\n\u003cp\u003eDo not increase temperature automatically during illness. Some infections progress faster at elevated temperatures, and certain medications or fish species require specific temperature limits.\u003c\/p\u003e\n\u003cp\u003eFollow an appropriate diagnosis and treatment plan rather than using heat as a universal disease treatment.\u003c\/p\u003e\n\u003ch3\u003eOne Heater vs. Two Smaller Heaters\u003c\/h3\u003e\n\u003cp\u003eSome medium and large aquariums may benefit from using two smaller heaters placed at opposite ends of the tank. This arrangement can improve heat distribution and provide limited backup if one unit stops operating.\u003c\/p\u003e\n\u003cp\u003eThe combined wattage should still match the aquarium’s total volume and room conditions. Two heaters do not eliminate the need for a thermometer or routine inspection.\u003c\/p\u003e\n\u003ch3\u003eCleaning and Maintenance\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the heater from power.\u003c\/li\u003e\n\u003cli\u003eAllow it to cool while submerged.\u003c\/li\u003e\n\u003cli\u003eRemove it carefully from the aquarium.\u003c\/li\u003e\n\u003cli\u003eWipe away algae and mineral buildup with a soft cloth or sponge.\u003c\/li\u003e\n\u003cli\u003eInspect the laboratory-glass jacket for cracks or damage.\u003c\/li\u003e\n\u003cli\u003eInspect the power cord, plug, holder, and suction cups.\u003c\/li\u003e\n\u003cli\u003eRinse according to the manufacturer’s directions.\u003c\/li\u003e\n\u003cli\u003eReinstall the heater fully underwater.\u003c\/li\u003e\n\u003cli\u003eAllow it to acclimate before reconnecting power.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not use abrasive pads, sharp scrapers, soap, bleach, or household cleaning chemicals.\u003c\/p\u003e\n\u003ch3\u003eElectrical Safety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCreate a drip loop below the electrical outlet\u003c\/li\u003e\n\u003cli\u003eUse a GFCI-protected outlet whenever possible\u003c\/li\u003e\n\u003cli\u003eKeep the plug and electrical connection dry\u003c\/li\u003e\n\u003cli\u003eDo not handle the plug with wet hands\u003c\/li\u003e\n\u003cli\u003eUnplug aquarium equipment before placing hands in the water\u003c\/li\u003e\n\u003cli\u003eNever use a heater with cracked glass or a damaged cord\u003c\/li\u003e\n\u003cli\u003eDo not pull or carry the heater by the power cord\u003c\/li\u003e\n\u003cli\u003eDo not cut, splice, or repair the electrical cord\u003c\/li\u003e\n\u003cli\u003eOperate the heater only while properly submerged\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Aquarium Heater Note\u003c\/h3\u003e\n\u003cp\u003eNo aquarium heater should be considered completely fail-proof. Use an independent thermometer and check aquarium temperature regularly.\u003c\/p\u003e\n\u003cp\u003eThe EHEIM thermocontrol 125 is rated for approximately 40–53 gallons, but actual heating ability depends on room temperature, aquarium design, lid coverage, circulation, and the required temperature increase.\u003c\/p\u003e\n\u003cp\u003eAutomatic dry-run protection is an additional safety feature, not permission to operate the heater outside the water.\u003c\/p\u003e\n\u003cp\u003eAlways unplug the heater before water changes, cleaning, removal, or aquarium maintenance.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this the same heater as the EHEIM Jäger 125W?\u003c\/strong\u003e\u003cbr\u003eThe current official name is EHEIM thermocontrol 125. It is the modern continuation of the heater commonly known as the EHEIM Jäger.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size aquarium is the 125W heater designed for?\u003c\/strong\u003e\u003cbr\u003eEHEIM rates it for approximately 150–200 liters, equivalent to about 40–53 US gallons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it only for aquariums up to 40 gallons?\u003c\/strong\u003e\u003cbr\u003eNo. EHEIM’s official range extends from approximately 40 to 53 gallons under suitable conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the adjustable temperature range?\u003c\/strong\u003e\u003cbr\u003eThe temperature can be set from approximately 65°F to 93°F, or 18°C to 34°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the temperature dial be calibrated?\u003c\/strong\u003e\u003cbr\u003eYes. The displayed setting can be recalibrated by approximately ±3.6°F, or ±2°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow accurate is the thermostat?\u003c\/strong\u003e\u003cbr\u003eEHEIM lists a temperature-control accuracy of approximately ±0.9°F, or ±0.5°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the glass shatterproof?\u003c\/strong\u003e\u003cbr\u003eEHEIM uses durable special laboratory glass, but no glass aquarium heater should be described as completely shatterproof.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the heater fully submersible?\u003c\/strong\u003e\u003cbr\u003eYes. EHEIM describes it as watertight and completely submersible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have dry-run protection?\u003c\/strong\u003e\u003cbr\u003eYes. Thermo Safety Control automatically switches the heater off if it is accidentally operated outside the water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an indicator light?\u003c\/strong\u003e\u003cbr\u003eYes. A control lamp indicates when the heater is actively heating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be installed horizontally?\u003c\/strong\u003e\u003cbr\u003eIt may be positioned according to the included instructions as long as it remains fully submerged and has adequate water circulation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in freshwater?\u003c\/strong\u003e\u003cbr\u003eYes. It is suitable for freshwater aquariums.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in saltwater?\u003c\/strong\u003e\u003cbr\u003eYes. EHEIM approves the thermocontrol heater for marine aquarium use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for planted aquariums?\u003c\/strong\u003e\u003cbr\u003eYes, provided the selected temperature is suitable for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I use a separate thermometer?\u003c\/strong\u003e\u003cbr\u003eYes. An independent thermometer is recommended to verify the actual aquarium temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould the heater be unplugged during water changes?\u003c\/strong\u003e\u003cbr\u003eYes. Disconnect it before lowering the water level and allow it to cool before exposing or removing it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the heater?\u003c\/strong\u003e\u003cbr\u003eThe 125W model is approximately 319 mm, or 12.6 inches, long.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the power cable?\u003c\/strong\u003e\u003cbr\u003eThe cable is approximately 170 cm, or 5.6 feet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the heater include mounting hardware?\u003c\/strong\u003e\u003cbr\u003eYes. It includes a double suction-cup holder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer guarantee?\u003c\/strong\u003e\u003cbr\u003eEHEIM lists a three-year manufacturer guarantee for the thermocontrol 125.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 125W Adjustable Aquarium Heater provides precise, recalibratable temperature control for freshwater and saltwater aquariums between approximately 40 and 53 gallons. Its special laboratory-glass jacket, adjustable 65–93°F range, heating indicator, automatic dry-run shutoff, and double suction-cup holder make it a dependable choice for medium aquarium systems.\u003c\/p\u003e\n\u003cp\u003eVisit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop EHEIM aquarium heaters, filters, replacement parts, thermometers, temperature controllers, and aquarium equipment.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52129721450709,"sku":null,"price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/720686361379.jpg?v=1759326089"},{"product_id":"eheim-jager-300w-fully-submersible-aquarium-heater-with-thermo-control","title":"Eheim Jager 300W Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 300W Submersible Aquarium Heater with Thermo Control\u003c\/strong\u003e is the powerhouse of the Jager line, built to warm large aquariums of roughly 159–264 gallons with adjustable thermostatic heating. Fully submersible with the calibratable TruTemp dial (65–93°F \/ 18–34°C), shatter-resistant glass, and automatic dry-run shutoff, it keeps big tropical and marine tanks at a steady, safe temperature.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 watts of reliable heat:\u003c\/strong\u003e Built for large aquariums in the 159–264 gallon range — the top of the Jäger lineup\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Looking at the larger Jagers? Compare the \u003ca href=\"\/products\/eheim-jager-200w-submersible-aquarium-heater\"\u003e200W\u003c\/a\u003e and \u003ca href=\"\/products\/eheim-jager-250w-submersible-aquarium-heater\"\u003e250W\u003c\/a\u003e. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52211594920149,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/720686361591.jpg?v=1760635727"},{"product_id":"hygger-hg031-100w-aquarium-heater-compact-submersible-thermostat-heater","title":"Hygger HG031 100W Aquarium Heater","description":"\u003cp data-end=\"274\" data-start=\"253\"\u003eThe \u003cstrong data-end=\"316\" data-start=\"279\"\u003eHygger HG031 100W Aquarium Heater\u003c\/strong\u003e is a \u003cstrong data-end=\"372\" data-start=\"322\"\u003edurable, compact, and fully submersible heater\u003c\/strong\u003e designed to maintain precise and stable temperatures in small to medium aquariums. Ideal for \u003cstrong data-end=\"510\" data-start=\"466\"\u003efreshwater, saltwater, and planted tanks\u003c\/strong\u003e, this heater provides consistent warmth for your fish, shrimp, and aquatic plants.\u003c\/p\u003e\n\u003cp data-end=\"785\" data-start=\"597\"\u003eEquipped with an \u003cstrong data-end=\"647\" data-start=\"614\"\u003eintelligent thermostat system\u003c\/strong\u003e, the HG031 automatically maintains your desired temperature while ensuring safety through built-in \u003cstrong data-end=\"782\" data-start=\"747\"\u003eoverheat and dry-run protection\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-end=\"817\" data-start=\"792\"\u003e\u003cstrong data-end=\"815\" data-start=\"799\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"1256\" data-start=\"818\"\u003e\u003cstrong data-end=\"856\" data-start=\"822\"\u003eAdjustable Temperature Control\u003c\/strong\u003e Easy dial allows precise settings from \u003cstrong data-end=\"919\" data-start=\"898\"\u003e59–93°F (15–34°C)\u003c\/strong\u003e\u003cbr data-end=\"922\" data-start=\"919\"\u003e \u003cstrong data-end=\"953\" data-start=\"925\"\u003eFully Submersible Design\u003c\/strong\u003e Compact size fits vertically or horizontally in most tanks\u003cbr data-end=\"1017\" data-start=\"1014\"\u003e \u003cstrong data-end=\"1035\" data-start=\"1020\"\u003e100W Output\u003c\/strong\u003e Ideal for aquariums up to \u003cstrong data-end=\"1078\" data-start=\"1064\"\u003e25 gallons\u003c\/strong\u003e\u003cbr data-end=\"1081\" data-start=\"1078\"\u003e \u003cstrong data-end=\"1113\" data-start=\"1084\"\u003eSmart Overheat Protection\u003c\/strong\u003e Automatically shuts off when out of water or overheating\u003cbr data-end=\"1175\" data-start=\"1172\"\u003e🐠 \u003cstrong data-end=\"1215\" data-start=\"1178\"\u003eDurable Quartz Glass Construction\u003c\/strong\u003e Shatterproof and corrosion-resistant\u003c\/p\u003e\n\u003ch3 data-end=\"1290\" data-start=\"1263\"\u003e \u003cstrong data-end=\"1288\" data-start=\"1270\"\u003eSpecifications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-end=\"1312\" data-start=\"1293\"\u003e\n\u003cstrong data-end=\"1303\" data-start=\"1293\"\u003eBrand:\u003c\/strong\u003e Hygger\u003c\/li\u003e\n\u003cli data-end=\"1333\" data-start=\"1315\"\u003e\n\u003cstrong data-end=\"1325\" data-start=\"1315\"\u003eModel:\u003c\/strong\u003e HG031\u003c\/li\u003e\n\u003cli data-end=\"1358\" data-start=\"1336\"\u003e\n\u003cstrong data-end=\"1346\" data-start=\"1336\"\u003ePower:\u003c\/strong\u003e 100 Watts\u003c\/li\u003e\n\u003cli data-end=\"1384\" data-start=\"1361\"\u003e\n\u003cstrong data-end=\"1373\" data-start=\"1361\"\u003eVoltage:\u003c\/strong\u003e 110–120V\u003c\/li\u003e\n\u003cli data-end=\"1431\" data-start=\"1387\"\u003e\n\u003cstrong data-end=\"1409\" data-start=\"1387\"\u003eTemperature Range:\u003c\/strong\u003e 59–93°F (15–34°C)\u003c\/li\u003e\n\u003cli data-end=\"1454\" data-start=\"1434\"\u003e\n\u003cstrong data-end=\"1447\" data-start=\"1434\"\u003eAccuracy:\u003c\/strong\u003e ±1°F\u003c\/li\u003e\n\u003cli data-end=\"1490\" data-start=\"1457\"\u003e\n\u003cstrong data-end=\"1471\" data-start=\"1457\"\u003eTank Size:\u003c\/strong\u003e 10–26 gallons\u003c\/li\u003e\n\u003cli data-end=\"1518\" data-start=\"1493\"\u003e\n\u003cstrong data-end=\"1509\" data-start=\"1493\"\u003eCord Length:\u003c\/strong\u003e 5.5 ft\u003c\/li\u003e\n\u003cli data-end=\"1572\" data-start=\"1521\"\u003e\n\u003cstrong data-end=\"1534\" data-start=\"1521\"\u003eMaterial:\u003c\/strong\u003e Quartz glass with protective casing\u003c\/li\u003e\n\u003cli data-end=\"1626\" data-start=\"1575\"\u003e\n\u003cstrong data-end=\"1588\" data-start=\"1575\"\u003eMounting:\u003c\/strong\u003e Fully submersible with suction cups\u003c\/li\u003e\n\u003cli data-end=\"1676\" data-start=\"1629\"\u003e\n\u003cstrong data-end=\"1649\" data-start=\"1629\"\u003eIndicator Light:\u003c\/strong\u003e Yes heating status LED\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"1706\" data-start=\"1683\"\u003e💡 \u003cstrong data-end=\"1704\" data-start=\"1690\"\u003eUsage Tips\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-end=\"1780\" data-start=\"1709\"\u003ePlace near a \u003cstrong data-end=\"1750\" data-start=\"1722\"\u003efilter outlet or bubbler\u003c\/strong\u003e for even heat distribution.\u003c\/li\u003e\n\u003cli data-end=\"1856\" data-start=\"1783\"\u003eAllow \u003cstrong data-end=\"1806\" data-start=\"1789\"\u003e1015 minutes\u003c\/strong\u003e for temperature acclimation before plugging in.\u003c\/li\u003e\n\u003cli data-end=\"1910\" data-start=\"1859\"\u003eUse a \u003cstrong data-end=\"1888\" data-start=\"1865\"\u003edigital thermometer\u003c\/strong\u003e to verify accuracy.\u003c\/li\u003e\n\u003cli data-end=\"1971\" data-start=\"1913\"\u003eSuitable for \u003cstrong data-end=\"1969\" data-start=\"1926\"\u003efreshwater, marine, and planted setups.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"1991\" data-start=\"1978\"\u003e \u003cstrong data-end=\"1991\" data-start=\"1984\"\u003eFAQ\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-end=\"2121\" data-start=\"1993\"\u003e\u003cstrong data-end=\"2038\" data-start=\"1993\"\u003eQ: Is the Hygger HG031 heater adjustable?\u003c\/strong\u003e\u003cbr data-end=\"2041\" data-start=\"2038\"\u003eA: Yes, you can easily set the temperature from 59–93°F with the control dial.\u003c\/p\u003e\n\u003cp data-end=\"2221\" data-start=\"2123\"\u003e\u003cstrong data-end=\"2173\" data-start=\"2123\"\u003eQ: What size tank does the 100W model support?\u003c\/strong\u003e\u003cbr data-end=\"2176\" data-start=\"2173\"\u003eA: Best for aquariums up to \u003cstrong data-end=\"2218\" data-start=\"2204\"\u003e25 gallons\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"2317\" data-start=\"2223\"\u003e\u003cstrong data-end=\"2259\" data-start=\"2223\"\u003eQ: Does it have safety shut-off?\u003c\/strong\u003e\u003cbr data-end=\"2262\" data-start=\"2259\"\u003eA: Yes, includes both overheat and dry-run protection.\u003c\/p\u003e\n\u003cp data-end=\"2433\" data-start=\"2319\"\u003e\u003cstrong data-end=\"2361\" data-start=\"2319\"\u003eQ: Is it suitable for saltwater tanks?\u003c\/strong\u003e\u003cbr data-end=\"2364\" data-start=\"2361\"\u003eA: Absolutelyworks great in freshwater, marine, and planted tanks.\u003c\/p\u003e\n\u003cp data-end=\"2557\" data-start=\"2435\"\u003e\u003cstrong data-end=\"2472\" data-start=\"2435\"\u003eQ: Can I install it horizontally?\u003c\/strong\u003e\u003cbr data-end=\"2475\" data-start=\"2472\"\u003eA: Yeshorizontal or vertical placement is fine as long as its fully submerged.\u003c\/p\u003e","brand":"Hygger","offers":[{"title":"Default Title","offer_id":52321321844949,"sku":null,"price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/HyggerHG031100WAquariumHeater_CompactSubmersibleThermostatHeater.jpg?v=1763216924"},{"product_id":"hygger-hg031-25w-aquarium-heater","title":"Hygger HG031 25W Aquarium Heater","description":"\u003ch2\u003eHygger HG031 25W Adjustable Aquarium Heater\u003c\/h2\u003e\u003cp\u003eKeep the water temperature steady in a compact freshwater or saltwater aquarium with the Hygger HG031 25-watt submersible heater. Designed for approximately \u003cstrong\u003e5–10 gallon tanks\u003c\/strong\u003e, this model has an external temperature controller so you can change the setting without reaching into the aquarium.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25W heating power:\u003c\/strong\u003e Manufacturer-listed for approximately 5–10 US gallons.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable temperature:\u003c\/strong\u003e 59–93°F (15–34°C).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal controller:\u003c\/strong\u003e Convenient adjustment outside the aquarium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubmersible heating element:\u003c\/strong\u003e Install according to the included manufacturer's instructions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eChoosing the Right Heater\u003c\/h3\u003e\u003cp\u003eThe right wattage depends on tank capacity, room temperature, circulation, and your fish or invertebrates' temperature requirements. Use a separate thermometer to verify actual water temperature, especially in a nano aquarium where temperatures can change quickly.\u003c\/p\u003e\u003ch3\u003eShop Online or in Cheyenne\u003c\/h3\u003e\u003cp\u003eOrder this aquarium heater from Tropical Treasures Wyo for shipping where available at checkout, or choose local pickup in Cheyenne, Wyoming. For compatible aquarium supplies, browse our \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heater selection\u003c\/a\u003e.\u003c\/p\u003e","brand":"Hygger","offers":[{"title":"Default Title","offer_id":52321339441365,"sku":null,"price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/HyggerHG031100WAquariumHeater_CompactSubmersibleThermostatHeater_fba5ee37-2db9-4451-865a-81ee82110924.jpg?v=1763217815"},{"product_id":"eheim-jager-200w-submersible-aquarium-heater","title":"Eheim Jager 200W Submersible Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 200W Submersible Aquarium Heater\u003c\/strong\u003e is built to warm larger aquariums of roughly 79–106 gallons with the same German precision the Jager line is famous for. Adjustable TruTemp dial, shatter-resistant glass, and automatic dry-run protection mean stable temperatures and peace of mind for bigger tropical and marine setups.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e200 watts of reliable heat:\u003c\/strong\u003e Sized for larger aquariums around 79–106 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Need more or less power? See the \u003ca href=\"\/products\/eheim-jager-150w-aquarium-heater\"\u003e150W\u003c\/a\u003e and \u003ca href=\"\/products\/eheim-jager-250w-submersible-aquarium-heater\"\u003e250W\u003c\/a\u003e options. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52722065932501,"sku":null,"price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/720686361393.jpg?v=1764876096"},{"product_id":"eheim-thermocontrol-jager-75w-aquarium-heater","title":"EHEIM thermocontrol 75W Adjustable Aquarium Heater – 16 to 26 Gallons","description":"\u003cp\u003eThe EHEIM thermocontrol 75W Aquarium Heater, commonly known by its former EHEIM Jäger name, provides precise and adjustable temperature control for small-to-medium freshwater and saltwater aquariums.\u003c\/p\u003e\n\u003cp\u003eEHEIM rates the 75-watt model for aquariums from approximately 60 to 100 liters, equivalent to about 16 to 26 US gallons. Its broad adjustable temperature range makes it suitable for tropical community aquariums, planted tanks, shrimp systems, marine aquariums, quarantine tanks, and other setups that require dependable temperature control.\u003c\/p\u003e\n\u003cp\u003eThe heater uses a special laboratory-glass jacket designed to increase the heating surface and distribute heat evenly. It is completely submersible and includes automatic dry-run shutoff, a visible heating indicator lamp, a recalibratable temperature dial, and a double suction-cup holder.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e75-Watt Heating Output:\u003c\/strong\u003e Designed for aquariums from approximately 16 to 26 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Temperature:\u003c\/strong\u003e Select temperatures from approximately 65°F to 93°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecalibratable Dial:\u003c\/strong\u003e Temperature scale can be corrected by approximately ±3.6°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Temperature Control:\u003c\/strong\u003e Manufacturer-listed accuracy of approximately ±0.9°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Submersible:\u003c\/strong\u003e Watertight construction permits complete underwater installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatically switches the heater off during accidental dry operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial Laboratory Glass:\u003c\/strong\u003e Increases the heating surface and promotes even heat distribution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Indicator Lamp:\u003c\/strong\u003e Shows when the heater is actively producing heat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Suction-Cup Holder:\u003c\/strong\u003e Secures the heater to the aquarium wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and Marine Compatible:\u003c\/strong\u003e Suitable for freshwater and saltwater aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in Germany:\u003c\/strong\u003e Manufactured according to EHEIM quality and safety standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e EHEIM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Product Name:\u003c\/strong\u003e thermocontrol 75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormer\/Common Name:\u003c\/strong\u003e EHEIM Jäger 75W Aquarium Heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 3613010\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWattage:\u003c\/strong\u003e 75 watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Aquarium Volume:\u003c\/strong\u003e 60–100 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximate US Aquarium Volume:\u003c\/strong\u003e 16–26 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 65–93°F \/ 18–34°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature-Control Accuracy:\u003c\/strong\u003e Approximately ±0.9°F \/ ±0.5°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration Adjustment:\u003c\/strong\u003e Approximately ±3.6°F \/ ±2°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater Diameter:\u003c\/strong\u003e Approximately 36 mm \/ 1.4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater Length:\u003c\/strong\u003e Approximately 270 mm \/ 10.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e Approximately 170 cm \/ 5.6 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Compatibility:\u003c\/strong\u003e Freshwater and saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Guarantee:\u003c\/strong\u003e Three years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAquariums between approximately 16 and 26 gallons\u003c\/li\u003e\n\u003cli\u003e20-gallon high and 20-gallon long aquariums\u003c\/li\u003e\n\u003cli\u003eFreshwater tropical community tanks\u003c\/li\u003e\n\u003cli\u003ePlanted aquariums\u003c\/li\u003e\n\u003cli\u003eBetta community aquariums\u003c\/li\u003e\n\u003cli\u003eShrimp aquariums within the recommended capacity\u003c\/li\u003e\n\u003cli\u003eSmall cichlid aquariums\u003c\/li\u003e\n\u003cli\u003eMarine and saltwater aquariums\u003c\/li\u003e\n\u003cli\u003eQuarantine and observation tanks\u003c\/li\u003e\n\u003cli\u003eAquariums requiring an adjustable temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAdjustable Temperature Range\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 75 may be adjusted from approximately 65°F to 93°F, or 18°C to 34°C.\u003c\/p\u003e\n\u003cp\u003eThis wide range allows the heater to be matched to the temperature requirements of many freshwater and marine species. Always research the preferred range of the fish, shrimp, plants, corals, or other animals being maintained.\u003c\/p\u003e\n\u003cp\u003eDo not raise the aquarium temperature simply because the heater can reach a higher setting. Warmer water holds less dissolved oxygen and may increase fish metabolism, stress, and the progression of certain illnesses.\u003c\/p\u003e\n\u003ch3\u003eTemperature Calibration\u003c\/h3\u003e\n\u003cp\u003eThe adjustable dial can be recalibrated if the selected setting consistently differs from the temperature shown by a reliable aquarium thermometer.\u003c\/p\u003e\n\u003cp\u003eEHEIM provides a recalibration range of approximately ±2°C, equivalent to about ±3.6°F.\u003c\/p\u003e\n\u003cp\u003eBefore recalibrating:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eInstall the heater where water circulates steadily around it.\u003c\/li\u003e\n\u003cli\u003ePlace an independent thermometer away from the heater.\u003c\/li\u003e\n\u003cli\u003eAllow the aquarium temperature to stabilize for at least 24 hours.\u003c\/li\u003e\n\u003cli\u003eCompare the actual water temperature with the selected heater setting.\u003c\/li\u003e\n\u003cli\u003eFollow the included EHEIM instructions to adjust the calibration ring.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not recalibrate based on a single reading immediately after installation, feeding, maintenance, or a water change.\u003c\/p\u003e\n\u003ch3\u003eTemperature-Control Accuracy\u003c\/h3\u003e\n\u003cp\u003eEHEIM lists an operating accuracy of approximately ±0.5°C, equivalent to about ±0.9°F.\u003c\/p\u003e\n\u003cp\u003eThe temperature observed in the aquarium may still vary because of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWater circulation\u003c\/li\u003e\n\u003cli\u003eRoom temperature\u003c\/li\u003e\n\u003cli\u003eAquarium size and shape\u003c\/li\u003e\n\u003cli\u003eOpen-top or covered construction\u003c\/li\u003e\n\u003cli\u003eHeater placement\u003c\/li\u003e\n\u003cli\u003eFilter and pump operation\u003c\/li\u003e\n\u003cli\u003eAccuracy and location of the separate thermometer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf different areas of the aquarium show noticeably different temperatures, improve circulation or reposition the heater and thermometer.\u003c\/p\u003e\n\u003ch3\u003eRecommended Aquarium Size\u003c\/h3\u003e\n\u003cp\u003eEHEIM rates the thermocontrol 75 for aquariums from approximately 60 to 100 liters, which converts to about 16–26 US gallons.\u003c\/p\u003e\n\u003cp\u003eThe correct heater size depends on more than aquarium capacity. Consider:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe difference between room temperature and desired water temperature\u003c\/li\u003e\n\u003cli\u003eWhether the aquarium has a lid\u003c\/li\u003e\n\u003cli\u003eCold drafts, windows, and exterior walls\u003c\/li\u003e\n\u003cli\u003eOpen-top evaporation\u003c\/li\u003e\n\u003cli\u003eWater circulation\u003c\/li\u003e\n\u003cli\u003eAdditional water contained in a sump\u003c\/li\u003e\n\u003cli\u003eThe aquarium’s exposed surface area\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA 75W heater may provide sufficient heating for a covered 26-gallon aquarium in a warm room but may struggle in the same aquarium when the room is substantially colder.\u003c\/p\u003e\n\u003ch3\u003eEHEIM thermocontrol Heater Sizing Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25W:\u003c\/strong\u003e Approximately 5–7 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50W:\u003c\/strong\u003e Approximately 7–16 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75W:\u003c\/strong\u003e Approximately 16–26 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100W:\u003c\/strong\u003e Approximately 26–40 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e125W:\u003c\/strong\u003e Approximately 40–53 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150W:\u003c\/strong\u003e Approximately 53–79 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e200W:\u003c\/strong\u003e Approximately 79–106 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250W:\u003c\/strong\u003e Approximately 106–159 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300W:\u003c\/strong\u003e Approximately 159–264 gallons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese conversions are based on EHEIM’s published liter ranges. Room conditions and the required temperature increase may require a different wattage.\u003c\/p\u003e\n\u003ch3\u003eSpecial Laboratory-Glass Construction\u003c\/h3\u003e\n\u003cp\u003eEHEIM uses a jacket made from special laboratory glass. The glass increases the effective heating surface, promotes even heat emission, and provides a heat shield around the internal element.\u003c\/p\u003e\n\u003cp\u003eEHEIM also describes the glass as resistant to chemical and biological substances commonly encountered in aquarium water.\u003c\/p\u003e\n\u003cp\u003eThe product should not be described as completely shatterproof. Inspect the heater regularly and discontinue use if the glass becomes cracked, chipped, or damaged.\u003c\/p\u003e\n\u003ch3\u003eThermo Safety Control\u003c\/h3\u003e\n\u003cp\u003eThe thermocontrol 75 includes automatic dry-run shutoff, which EHEIM calls Thermo Safety Control.\u003c\/p\u003e\n\u003cp\u003eThis protection is designed to switch off the heater if it is accidentally operated outside the water. It reduces risk but does not replace proper handling.\u003c\/p\u003e\n\u003cp\u003eAlways unplug the heater before:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLowering the aquarium water level\u003c\/li\u003e\n\u003cli\u003ePerforming a water change\u003c\/li\u003e\n\u003cli\u003eRemoving the heater\u003c\/li\u003e\n\u003cli\u003eCleaning the aquarium\u003c\/li\u003e\n\u003cli\u003ePlacing hands in the water\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHeating Indicator Lamp\u003c\/h3\u003e\n\u003cp\u003eThe control lamp illuminates when the heater is actively producing heat. It switches off when the thermostat reaches the selected temperature.\u003c\/p\u003e\n\u003cp\u003eNormal cycling is expected. The indicator does not need to remain illuminated continuously for the aquarium temperature to remain stable.\u003c\/p\u003e\n\u003cp\u003eIf the lamp remains on continuously while the aquarium stays below the selected temperature, the heater may be undersized, improperly positioned, or affected by unusually cold room conditions.\u003c\/p\u003e\n\u003ch3\u003eInstallation Instructions\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInspect the heater, glass tube, power cord, plug, holder, and suction cups.\u003c\/li\u003e\n\u003cli\u003eDo not use the heater if any part appears damaged.\u003c\/li\u003e\n\u003cli\u003eAttach the included double suction-cup holder.\u003c\/li\u003e\n\u003cli\u003ePosition the heater fully underwater.\u003c\/li\u003e\n\u003cli\u003eInstall it near steady water movement from a filter outlet or circulation pump.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to acclimate to the aquarium water before plugging it in.\u003c\/li\u003e\n\u003cli\u003eCreate a drip loop in the power cord below the electrical outlet.\u003c\/li\u003e\n\u003cli\u003eSelect the desired temperature.\u003c\/li\u003e\n\u003cli\u003eConnect the heater to power.\u003c\/li\u003e\n\u003cli\u003eVerify the actual aquarium temperature using a separate thermometer.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eRead and follow the complete EHEIM operating manual included with the heater.\u003c\/p\u003e\n\u003ch3\u003eHorizontal or Vertical Installation\u003c\/h3\u003e\n\u003cp\u003eThe heater may be installed horizontally, vertically, or at an angle when permitted by the aquarium layout and EHEIM instructions.\u003c\/p\u003e\n\u003cp\u003eThe heater must remain fully submerged and have water circulating freely around its glass jacket.\u003c\/p\u003e\n\u003cp\u003eA horizontal or angled position low in the aquarium may help distribute heat as warmed water rises. Vertical placement may be more convenient near a filter intake or return.\u003c\/p\u003e\n\u003cp\u003eDo not bury the heater in substrate or allow it to rest directly against rock, wood, decorations, or the aquarium bottom.\u003c\/p\u003e\n\u003ch3\u003eBest Heater Placement\u003c\/h3\u003e\n\u003cp\u003ePlace the heater near steady water flow from a hang-on-back filter, canister-filter return, internal filter, or circulation pump.\u003c\/p\u003e\n\u003cp\u003eConsistent circulation carries warmed water throughout the aquarium and reduces warm and cool areas.\u003c\/p\u003e\n\u003cp\u003eAvoid placing the heater:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIn a stagnant corner\u003c\/li\u003e\n\u003cli\u003eBehind decorations that block circulation\u003c\/li\u003e\n\u003cli\u003eDirectly beneath loose rocks\u003c\/li\u003e\n\u003cli\u003eWhere fish can wedge it against the aquarium wall\u003c\/li\u003e\n\u003cli\u003eWhere the water level may fall below it during routine maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUsing a Separate Thermometer\u003c\/h3\u003e\n\u003cp\u003eAlways use an independent aquarium thermometer with the EHEIM thermocontrol heater.\u003c\/p\u003e\n\u003cp\u003ePlace the thermometer away from the heater so it measures the overall aquarium temperature instead of the warmer water immediately around the heating element.\u003c\/p\u003e\n\u003cp\u003eA separate thermometer helps identify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncorrect dial settings\u003c\/li\u003e\n\u003cli\u003eCalibration differences\u003c\/li\u003e\n\u003cli\u003eInsufficient heater wattage\u003c\/li\u003e\n\u003cli\u003ePoor water circulation\u003c\/li\u003e\n\u003cli\u003eEquipment failure\u003c\/li\u003e\n\u003cli\u003eSeasonal changes in room temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWater-Change Safety\u003c\/h3\u003e\n\u003cp\u003eUnplug the heater before lowering the aquarium water level. Allow it to cool while it remains underwater before removing it or exposing the glass to air.\u003c\/p\u003e\n\u003cp\u003eAfter refilling the aquarium, confirm that the heater is fully submerged and allow the glass to acclimate before reconnecting power.\u003c\/p\u003e\n\u003cp\u003eAvoid pouring significantly colder replacement water directly onto a hot glass heater.\u003c\/p\u003e\n\u003ch3\u003eFreshwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 75 may be used in freshwater tropical community tanks, planted aquariums, cichlid systems, shrimp tanks, quarantine aquariums, and breeding setups within its recommended capacity.\u003c\/p\u003e\n\u003cp\u003eThe adjustable thermostat allows the temperature to be selected for the livestock rather than relying on a fixed factory setting.\u003c\/p\u003e\n\u003ch3\u003eSaltwater Aquarium Use\u003c\/h3\u003e\n\u003cp\u003eEHEIM approves the thermocontrol heater for marine and saltwater aquarium use.\u003c\/p\u003e\n\u003cp\u003eInspect the glass, holder, suction cups, and power cord regularly for salt and mineral accumulation. Disconnect the heater from power before cleaning.\u003c\/p\u003e\n\u003cp\u003eFor valuable marine livestock, consider using an independent temperature controller or alarm for additional monitoring.\u003c\/p\u003e\n\u003ch3\u003eUse in Planted Aquariums\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in planted aquariums when its wattage and selected temperature are suitable for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003ePosition it where dense plant growth will not restrict circulation or prevent regular inspection.\u003c\/p\u003e\n\u003cp\u003eThe heater provides temperature control only. It does not supply lighting, carbon dioxide, fertilizer, or plant nutrients.\u003c\/p\u003e\n\u003ch3\u003eUse with Bettas\u003c\/h3\u003e\n\u003cp\u003eThe adjustable temperature range makes the 75W thermocontrol suitable for betta aquariums within its recommended 16–26 gallon range.\u003c\/p\u003e\n\u003cp\u003eSelect a temperature appropriate for the fish and monitor the tank using a separate thermometer.\u003c\/p\u003e\n\u003cp\u003eThis heater is generally too powerful and physically large for small betta bowls or nano tanks below the manufacturer’s recommended capacity.\u003c\/p\u003e\n\u003ch3\u003eUse with Shrimp\u003c\/h3\u003e\n\u003cp\u003eThe heater may be used in appropriately sized shrimp aquariums when the selected temperature matches the shrimp species.\u003c\/p\u003e\n\u003cp\u003eSome Neocaridina shrimp tolerate typical tropical temperatures, while many Caridina species prefer cooler conditions. Warmer water also contains less dissolved oxygen.\u003c\/p\u003e\n\u003cp\u003eResearch the specific species and monitor the aquarium temperature carefully.\u003c\/p\u003e\n\u003ch3\u003eUse in Quarantine and Hospital Tanks\u003c\/h3\u003e\n\u003cp\u003eThe adjustable dial can be useful in quarantine and observation systems where temperature must be matched to a particular fish species.\u003c\/p\u003e\n\u003cp\u003eDo not automatically raise the temperature when fish become ill. Some infections progress more rapidly in warm water, and medications may have specific temperature limitations.\u003c\/p\u003e\n\u003cp\u003eFollow an appropriate diagnosis and treatment plan rather than using heat as a universal disease treatment.\u003c\/p\u003e\n\u003ch3\u003eCleaning and Maintenance\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the heater from power.\u003c\/li\u003e\n\u003cli\u003eAllow it to cool while submerged.\u003c\/li\u003e\n\u003cli\u003eRemove it carefully from the aquarium.\u003c\/li\u003e\n\u003cli\u003eWipe away algae and mineral deposits with a soft cloth or sponge.\u003c\/li\u003e\n\u003cli\u003eInspect the laboratory-glass jacket for cracks or damage.\u003c\/li\u003e\n\u003cli\u003eInspect the power cord, plug, holder, and suction cups.\u003c\/li\u003e\n\u003cli\u003eRinse according to the manufacturer’s directions.\u003c\/li\u003e\n\u003cli\u003eReinstall the heater fully underwater.\u003c\/li\u003e\n\u003cli\u003eAllow it to acclimate before reconnecting power.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not use abrasive pads, sharp scrapers, soap, bleach, or household cleaning chemicals.\u003c\/p\u003e\n\u003ch3\u003eElectrical Safety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCreate a drip loop below the electrical outlet\u003c\/li\u003e\n\u003cli\u003eUse a GFCI-protected outlet whenever possible\u003c\/li\u003e\n\u003cli\u003eKeep the plug and electrical connections dry\u003c\/li\u003e\n\u003cli\u003eDo not handle the plug with wet hands\u003c\/li\u003e\n\u003cli\u003eUnplug aquarium equipment before placing hands in the water\u003c\/li\u003e\n\u003cli\u003eNever use a heater with cracked glass or a damaged cord\u003c\/li\u003e\n\u003cli\u003eDo not pull or carry the heater by the power cord\u003c\/li\u003e\n\u003cli\u003eDo not cut, splice, or repair the electrical cord\u003c\/li\u003e\n\u003cli\u003eOperate the heater only while properly submerged\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Aquarium Heater Note\u003c\/h3\u003e\n\u003cp\u003eNo aquarium heater should be considered completely fail-proof. Use an independent thermometer and check the temperature regularly.\u003c\/p\u003e\n\u003cp\u003eThe EHEIM thermocontrol 75 is rated for approximately 16–26 gallons, but actual heating performance depends on room temperature, aquarium design, lid coverage, circulation, and the required temperature increase.\u003c\/p\u003e\n\u003cp\u003eThermo Safety Control is an added protective feature, not permission to operate the heater outside the water.\u003c\/p\u003e\n\u003cp\u003eAlways unplug the heater before water changes, cleaning, removal, or other aquarium maintenance.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this the same heater as the EHEIM Jäger 75W?\u003c\/strong\u003e\u003cbr\u003eThe current official product name is EHEIM thermocontrol 75. It is the modern continuation of the heater commonly known as the EHEIM Jäger.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size aquarium is the 75W heater designed for?\u003c\/strong\u003e\u003cbr\u003eEHEIM rates it for approximately 60–100 liters, equivalent to about 16–26 US gallons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the adjustable temperature range?\u003c\/strong\u003e\u003cbr\u003eThe temperature can be selected from approximately 65°F to 93°F, or 18°C to 34°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the temperature dial be calibrated?\u003c\/strong\u003e\u003cbr\u003eYes. The displayed setting can be recalibrated by approximately ±3.6°F, or ±2°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow accurate is the thermostat?\u003c\/strong\u003e\u003cbr\u003eEHEIM lists a temperature-control accuracy of approximately ±0.9°F, or ±0.5°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the glass shatterproof?\u003c\/strong\u003e\u003cbr\u003eEHEIM uses durable special laboratory glass, but it should not be marketed as completely shatterproof.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the heater fully submersible?\u003c\/strong\u003e\u003cbr\u003eYes. EHEIM describes it as watertight and completely submersible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have dry-run protection?\u003c\/strong\u003e\u003cbr\u003eYes. Thermo Safety Control automatically switches the heater off during accidental operation outside the water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it have an indicator light?\u003c\/strong\u003e\u003cbr\u003eYes. A control lamp shows when the heater is actively heating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be installed horizontally?\u003c\/strong\u003e\u003cbr\u003eIt may be installed according to the manufacturer’s instructions as long as it remains fully submerged and has adequate circulation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in freshwater aquariums?\u003c\/strong\u003e\u003cbr\u003eYes. It is suitable for freshwater aquarium use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in saltwater aquariums?\u003c\/strong\u003e\u003cbr\u003eYes. EHEIM approves the thermocontrol heater for marine aquarium use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for planted aquariums?\u003c\/strong\u003e\u003cbr\u003eYes, provided the selected temperature is appropriate for the plants and livestock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for betta aquariums?\u003c\/strong\u003e\u003cbr\u003eYes, in aquariums within the recommended 16–26 gallon range. It is not intended for very small betta bowls.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I use a separate thermometer?\u003c\/strong\u003e\u003cbr\u003eYes. An independent aquarium thermometer is recommended to verify the actual water temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould the heater be unplugged during water changes?\u003c\/strong\u003e\u003cbr\u003eYes. Disconnect it before lowering the water level and allow it to cool before exposing or removing it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the heater?\u003c\/strong\u003e\u003cbr\u003eThe 75W model is approximately 270 mm, or 10.6 inches, long.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the power cable?\u003c\/strong\u003e\u003cbr\u003eThe cable is approximately 170 cm, or 5.6 feet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the heater include mounting hardware?\u003c\/strong\u003e\u003cbr\u003eYes. It includes a double suction-cup holder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer guarantee?\u003c\/strong\u003e\u003cbr\u003eEHEIM lists a three-year manufacturer guarantee for the thermocontrol 75.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eThe EHEIM thermocontrol 75W Adjustable Aquarium Heater provides precise, recalibratable temperature control for freshwater and saltwater aquariums between approximately 16 and 26 gallons. Its adjustable 65–93°F range, laboratory-glass jacket, heating indicator, Thermo Safety Control, and double suction-cup holder make it a dependable choice for small-to-medium aquarium systems.\u003c\/p\u003e\n\u003cp\u003eVisit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop EHEIM aquarium heaters, filters, replacement parts, thermometers, temperature controllers, and aquarium equipment.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":52723827343573,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/Eheim-ThermoControl-Heater-75-Watts-Box_1024x1024_402x_7262200f-06d3-4015-b3cb-8db927add912.jpg?v=1793903094"},{"product_id":"sicce-scuba-preset-aquarium-heater-250w","title":"Sicce Scuba Preset 250W Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eSicce Scuba Preset 250W Aquarium Heater\u003c\/strong\u003e is a durable, fully submersible heater built to keep large aquariums at a stable, comfortable temperature. Pre-set to maintain a consistent \u003cstrong\u003e77°F (25°C)\u003c\/strong\u003e, it delivers preset heating when properly sized and monitored for tropical fish, shrimp, and live plants.\u003c\/p\u003e\u003cp\u003eBuilt with \u003cstrong\u003eshatter-resistant glass\u003c\/strong\u003e, thermal overheat protection, and a precision thermostat, the Scuba Preset works dependably in \u003cstrong\u003efreshwater, saltwater, and planted aquariums\u003c\/strong\u003e and installs with the included suction-cup mount.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-set to 77°F (25°C)\u003c\/strong\u003e - ideal range for most tropical tanks, no adjustment needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250W output\u003c\/strong\u003e - sized for aquariums 53–75 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible\u003c\/strong\u003e - mount horizontally or vertically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant construction\u003c\/strong\u003e - durable glass housing for safety and longevity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic thermostat\u003c\/strong\u003e - maintains steady water temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater \u0026amp; saltwater safe\u003c\/strong\u003e - versatile for community, planted, and marine setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sicce\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Scuba Preset 250W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 250 Watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Setting:\u003c\/strong\u003e Pre-set 77°F (25°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Size:\u003c\/strong\u003e 53–75 US gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e shatter-resistant glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Freshwater or saltwater aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fully submersible (horizontal or vertical)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage Tips\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePosition the heater near steady water flow so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eLet the heater sit in the water 10-15 minutes before plugging in to avoid thermal shock.\u003c\/li\u003e\n\u003cli\u003ePair with a separate aquarium thermometer to monitor temperature accuracy.\u003c\/li\u003e\n\u003cli\u003eUnplug and allow the heater to cool before removing it from the tank.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHeater Sizing Guide\u003c\/h3\u003e\u003cp\u003eAs a rule of thumb, choose roughly 3-5 watts per gallon depending on how much warmer your tank needs to be than the room:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e50W - up to ~15 gallons\u003c\/li\u003e\n\u003cli\u003e100W - 20–35 gallons\u003c\/li\u003e\n\u003cli\u003e150W - 31–45 gallons\u003c\/li\u003e\n\u003cli\u003e200W - 40–60 gallons\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e250W - 53–75 gallons\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e300W - 65–90 gallons\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTemperature Accuracy and Safety\u003c\/h3\u003e\u003cp\u003eThis model is factory preset to approximately 77°F (25°C), with a manufacturer-stated tolerance of ±2°F (±1°C). It is not adjustable. Use a separate aquarium thermometer to verify the actual water temperature, and make sure the preset temperature suits the animals in the tank.\u003c\/p\u003e\u003cp\u003eInstall fully submerged with good water circulation, follow the supplied instructions, and arrange the power cord with a drip loop. Unplug before water changes or removal and let the heater cool while still submerged. Never operate an aquarium heater outside water.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I adjust the temperature?\u003c\/strong\u003e\u003cbr\u003eA: No - this model is pre-set to hold 77°F (25°C) automatically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it safe for saltwater tanks?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the Scuba Preset works in both freshwater and marine aquariums.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Does it need to be fully submerged?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it is designed for full submersion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What size tank is best for the 250W model?\u003c\/strong\u003e\u003cbr\u003eA: It works best for aquariums approximately 53–75 gallons.\u003c\/p\u003e","brand":"Sicce","offers":[{"title":"Default Title","offer_id":52975083913429,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SIC485-250W-packagingcopy.jpg?v=1768426169"},{"product_id":"eheim-jager-100w-submersible-aquarium-heater","title":"Eheim Jager 100W Submersible Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 100W Submersible Aquarium Heater\u003c\/strong\u003e hits the sweet spot for many popular tank sizes, comfortably warming aquariums in the 26–40 gallon range. German-engineered precision, a calibratable TruTemp dial, and shatter-resistant glass make it a heater that should be checked with a separate thermometer — fully submersible for freshwater or saltwater.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 watts of reliable heat:\u003c\/strong\u003e Ideal for aquariums around 26–40 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Bigger tank? Look at the \u003ca href=\"\/products\/eheim-jager-125w-aquarium-heater-fully-submersible\"\u003e125W\u003c\/a\u003e or \u003ca href=\"\/products\/eheim-jager-150w-aquarium-heater\"\u003e150W\u003c\/a\u003e. Smaller? The \u003ca href=\"\/products\/eheim-jager-75w-submersible-aquarium-heater\"\u003e75W\u003c\/a\u003e has you covered. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":53034703651029,"sku":null,"price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/720686261362.jpg?v=1769189010"},{"product_id":"eheim-jager-250w-submersible-aquarium-heater","title":"Eheim Jager 250W Submersible Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eEheim Jager 250W Submersible Aquarium Heater\u003c\/strong\u003e brings reliable, precise heating to large aquariums in the 106–159 gallon range. With its calibratable TruTemp dial, shatter-resistant glass, and Thermo Safety Control, it holds a steady temperature in bigger freshwater and marine systems where consistency really matters.\u003c\/p\u003e\n\u003ch3\u003eWhy aquarists trust the Jager\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e250 watts of reliable heat:\u003c\/strong\u003e Ideal for large aquariums around 106–159 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise TruTemp dial:\u003c\/strong\u003e Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully submersible:\u003c\/strong\u003e Mount it horizontally or vertically, freshwater or saltwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShatter-resistant glass:\u003c\/strong\u003e Lab-grade, durable construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo Safety Control:\u003c\/strong\u003e Automatic shutoff protects against accidental dry running\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; safety tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlace the heater near good water flow (by a filter outlet) so heat spreads evenly.\u003c\/li\u003e\n\u003cli\u003eAfter plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.\u003c\/li\u003e\n\u003cli\u003eAlways verify the actual tank temperature with a separate thermometer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure on sizing? Comparing the big Jagers? See the \u003ca href=\"\/products\/eheim-jager-200w-submersible-aquarium-heater\"\u003e200W\u003c\/a\u003e or the \u003ca href=\"\/products\/eheim-jager-300w-fully-submersible-aquarium-heater-with-thermo-control\"\u003e300W\u003c\/a\u003e. Browse all \u003ca href=\"\/collections\/aquarium-heaters-adjustable-fish-tank-heaters-for-freshwater-aquariums\"\u003eaquarium heaters\u003c\/a\u003e or the full \u003ca href=\"\/collections\/eheim\"\u003eEheim equipment lineup\u003c\/a\u003e.\u003c\/p\u003e","brand":"Eheim","offers":[{"title":"Default Title","offer_id":53080203952341,"sku":null,"price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/720686361409.jpg?v=1770072195"},{"product_id":"hygger-hg031-10w-mini-pro-aquarium-heater","title":"Hygger HG031 10W Mini Pro Aquarium Heater","description":"\u003cp\u003eThe \u003cstrong\u003eHygger HG031-10W Mini Pro Aquarium Heater\u003c\/strong\u003e is a compact, fully submersible aquarium heater designed for nano and small freshwater aquariums. Its small profile makes it a great choice for betta tanks, shrimp tanks, planted nano aquariums, quarantine tanks, and setups where a full-size heater may take up too much space.\u003c\/p\u003e\n\u003cp\u003eThis mini aquarium heater helps maintain stable water temperature, which is important for the health of tropical fish, shrimp, snails, and live plants. With reliable heating performance and built-in safety features, the Hygger HG031-10W is a convenient option for hobbyists who need dependable warmth in a small aquarium setup.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Mini Design:\u003c\/strong\u003e Great for nano aquariums, betta tanks, shrimp tanks, and small planted tanks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10W Heating Power:\u003c\/strong\u003e Designed for small freshwater aquarium setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Submersible:\u003c\/strong\u003e Installs inside the aquarium for consistent heat distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable Temperature Support:\u003c\/strong\u003e Helps reduce temperature swings that can stress fish and shrimp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater Safe:\u003c\/strong\u003e Ideal for tropical freshwater fish, shrimp, snails, and planted aquariums.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpace-Saving Profile:\u003c\/strong\u003e Fits easily in smaller tanks without taking up too much room.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-In Safety Protection:\u003c\/strong\u003e Designed with safety features to help support reliable operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hygger\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e HG031-10W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Mini submersible aquarium heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWattage:\u003c\/strong\u003e 10 watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Type:\u003c\/strong\u003e Freshwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Nano aquariums, betta tanks, shrimp tanks, small planted tanks, hospital tanks, and quarantine tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBetta fish tanks\u003c\/li\u003e\n\u003cli\u003eShrimp aquariums\u003c\/li\u003e\n\u003cli\u003eNano freshwater tanks\u003c\/li\u003e\n\u003cli\u003eSmall planted aquariums\u003c\/li\u003e\n\u003cli\u003eQuarantine tanks\u003c\/li\u003e\n\u003cli\u003eHospital tanks\u003c\/li\u003e\n\u003cli\u003eSmall tropical freshwater setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSetup \u0026amp; Usage Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the heater fully submerged according to the manufacturer’s instructions.\u003c\/li\u003e\n\u003cli\u003ePlace it in an area with good water flow for more even heat distribution.\u003c\/li\u003e\n\u003cli\u003eAllow the heater to acclimate in the water before plugging it in.\u003c\/li\u003e\n\u003cli\u003eAlways use a separate aquarium thermometer to verify water temperature.\u003c\/li\u003e\n\u003cli\u003eUnplug the heater before water changes or removing it from the aquarium.\u003c\/li\u003e\n\u003cli\u003eAlways follow the manufacturer’s tank size recommendations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Stable Aquarium Temperature Matters\u003c\/h3\u003e\n\u003cp\u003eTropical fish and shrimp can become stressed when aquarium temperature changes too quickly. Stable water temperature supports normal activity, digestion, immune health, and overall aquarium stability.\u003c\/p\u003e\n\u003cp\u003eA properly sized heater, paired with a thermometer, helps keep small aquariums more consistent and comfortable for sensitive freshwater livestock.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose the Hygger HG031-10W Mini Pro Heater?\u003c\/h3\u003e\n\u003cp\u003eThe Hygger HG031-10W Mini Pro Heater is ideal for aquarists who need a small, discreet heater for compact freshwater aquariums. Its mini size makes it easier to place in smaller tanks while still helping maintain the warm, stable environment needed for many tropical fish and shrimp.\u003c\/p\u003e\n\u003cp\u003eIt is especially useful for betta aquariums, shrimp tanks, planted nano tanks, quarantine setups, and small desktop aquariums.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat tank size is the Hygger HG031-10W heater best for?\u003c\/h4\u003e\n\u003cp\u003eThis heater is designed for nano and small freshwater aquariums. Always follow the manufacturer’s tank size recommendations and use a thermometer to confirm proper temperature.\u003c\/p\u003e\n\u003ch4\u003eIs this heater safe for shrimp tanks?\u003c\/h4\u003e\n\u003cp\u003eYes. When installed and used properly, this heater can be used in shrimp tanks and small freshwater aquariums.\u003c\/p\u003e\n\u003ch4\u003eCan the Hygger HG031-10W be used in saltwater?\u003c\/h4\u003e\n\u003cp\u003eThis model is intended for freshwater aquariums unless the manufacturer specifically states otherwise for your exact unit.\u003c\/p\u003e\n\u003ch4\u003eDoes this heater require a thermometer?\u003c\/h4\u003e\n\u003cp\u003eA separate aquarium thermometer is recommended with any heater so you can verify the actual water temperature.\u003c\/p\u003e\n\u003ch4\u003eCan I remove the heater while it is plugged in?\u003c\/h4\u003e\n\u003cp\u003eNo. Always unplug the heater before water changes, maintenance, or removing it from the aquarium.\u003c\/p\u003e\n\u003ch4\u003eIs this good for betta tanks?\u003c\/h4\u003e\n\u003cp\u003eYes. The compact size makes it a good option for many small betta aquariums when properly sized and installed.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eShop the \u003cstrong\u003eHygger HG031-10W Mini Pro Aquarium Heater\u003c\/strong\u003e online or in-store at Tropical Treasures Wyo in Cheyenne, Wyoming. This compact freshwater aquarium heater is a great option for betta tanks, shrimp aquariums, nano tanks, planted setups, hospital tanks, and quarantine aquariums.\u003c\/p\u003e\u003ch3\u003eHG031 10W Specifications\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRecommended aquarium size:\u003c\/strong\u003e 1–5 US gallons. \u003cstrong\u003eAdjustable temperature range:\u003c\/strong\u003e 59–93°F (15–34°C). Use the external temperature controller and check the aquarium temperature with a separate thermometer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManufacturer tank-size guidance:\u003c\/strong\u003e Hygger HG031 10W is rated for aquariums of approximately 1–5 US gallons. Adjustable temperature range: 59–93°F (15–34°C). Always verify water temperature with a separate thermometer. For a typical 5–10 gallon betta tank, consider the 25W version instead.\u003c\/p\u003e","brand":"Hygger","offers":[{"title":"Default Title","offer_id":53103367160021,"sku":null,"price":18.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/HYG98006-2T.jpg?v=1770494578"},{"product_id":"fluval-p50-pre-set-submersible-aquarium-heater-50w","title":"Fluval P50 Pre-Set Submersible Aquarium Heater – 50W","description":"\u003cp\u003eThe \u003cstrong\u003eFluval P50 Pre-Set Aquarium Heater\u003c\/strong\u003e is a compact, easy-to-use heater designed for aquariums up to \u003cstrong\u003e15 gallons\u003c\/strong\u003e. Pre-set to maintain a stable temperature range of approximately \u003cstrong\u003e76–78°F\u003c\/strong\u003e, this heater is a great option for small freshwater or saltwater aquariums.\u003c\/p\u003e\n\u003cp\u003eIts fully submersible design allows for flexible placement inside the aquarium, while the durable shatterproof polymer construction makes it a safe and reliable choice for smaller setups.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e50-watt pre-set aquarium heater\u003c\/li\u003e\n\u003cli\u003eRecommended for aquariums up to 15 US gallons \/ 50 liters\u003c\/li\u003e\n\u003cli\u003ePreset temperature range of approximately 76–78°F \/ 24–26°C\u003c\/li\u003e\n\u003cli\u003eFully submersible and waterproof design\u003c\/li\u003e\n\u003cli\u003eShatterproof polymer construction\u003c\/li\u003e\n\u003cli\u003eLED running lamp indicates when heater is in use\u003c\/li\u003e\n\u003cli\u003eCompact design for nano and small aquariums\u003c\/li\u003e\n\u003cli\u003eSuitable for freshwater and saltwater aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fluval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e P50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e A745\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 015561107457\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWattage:\u003c\/strong\u003e 50W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Size:\u003c\/strong\u003e Up to 15 US gallons \/ 50 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e Preset to approximately 76–78°F \/ 24–26°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 6.1\" L x 1.57\" W x 0.78\" H\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSmall community aquariums\u003c\/li\u003e\n\u003cli\u003eBetta tanks over 5 gallons\u003c\/li\u003e\n\u003cli\u003eNano planted aquariums\u003c\/li\u003e\n\u003cli\u003eShrimp tanks where steady temperature is needed\u003c\/li\u003e\n\u003cli\u003eSmall freshwater or saltwater setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Note\u003c\/h3\u003e\n\u003cp\u003eFor best results, keep the heater fully submerged while in use. Aquarium size, room temperature, water movement, and tank placement can affect heater performance.\u003c\/p\u003e\u003ch3\u003eHeater Installation and Safety\u003c\/h3\u003e\u003cp\u003eUse a separate aquarium thermometer to check actual water temperature. Follow the manufacturer's minimum-water-level and mounting instructions. Unplug the heater before water changes or removal, and allow it to cool in water before handling. Do not operate it outside the water unless the manufacturer expressly permits that use. Keep the heater where water can circulate around it, and make a drip loop in the power cord.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":53812929134805,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/A744_packaging-1_1.webp?v=1778796728"},{"product_id":"fluval-m50-submersible-heater-50w","title":"Fluval M50 Submersible Aquarium Heater 50W","description":"\u003cp\u003e\u003cstrong\u003eFluval M50 Submersible Aquarium Heater\u003c\/strong\u003e is a 50-watt adjustable aquarium heater featuring reflective glass and a computer-calibrated thermostat for compatible freshwater and saltwater aquariums.\u003c\/p\u003e\u003ch3\u003eManufacturer Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eModel: M50; Fluval item A781\u003c\/li\u003e\n\u003cli\u003eRated wattage: 50 W (120 V \/ 60 Hz)\u003c\/li\u003e\n\u003cli\u003eRecommended aquarium capacity: up to 15 US gallons\u003c\/li\u003e\n\u003cli\u003eDimensions: 11 × 1 × 1 inches\u003c\/li\u003e\n\u003cli\u003eAdjustable temperature range: 66–86°F (19–30°C)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation and Safety\u003c\/h3\u003e\u003cp\u003eFollow Fluval's instructions for installation and immersion. Use a separate aquarium thermometer to confirm temperature, keep the heater where water circulates, and unplug before handling or water changes. Allow it to cool while submerged before removal. Select heater capacity based on tank size and ambient room temperature.\u003c\/p\u003e\u003cp\u003eSee \u003ca href=\"https:\/\/fluvalaquatics.com\/us\/shop\/product\/m-series-heaters\"\u003eFluval M Series specifications\u003c\/a\u003e.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":53814767190229,"sku":null,"price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/A781_packaging-1.webp?v=1778849855"},{"product_id":"fluval-m200-submersible-heater-200w","title":"Fluval M200 Submersible Aquarium Heater 200W","description":"\u003cp\u003e\u003cstrong\u003eFluval M200 Submersible Aquarium Heater\u003c\/strong\u003e is a 200-watt adjustable aquarium heater with reflective borosilicate glass and a computer-calibrated thermostat. Designed for compatible freshwater and saltwater aquariums.\u003c\/p\u003e\u003ch3\u003eManufacturer Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eModel: M200; Fluval item A784\u003c\/li\u003e\n\u003cli\u003eRated wattage: 200 W (120 V \/ 60 Hz)\u003c\/li\u003e\n\u003cli\u003eRecommended aquarium capacity: up to 65 US gallons\u003c\/li\u003e\n\u003cli\u003eDimensions: 13 × 1 × 1 inches\u003c\/li\u003e\n\u003cli\u003eAdjustable temperature range: 66–86°F (19–30°C)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation and Safety\u003c\/h3\u003e\u003cp\u003eFollow Fluval's instructions for placement, immersion, and setup. Position where water circulates, use a separate thermometer to verify actual water temperature, and unplug before water changes or handling. Allow the heater to cool while submerged before removal. Actual heating capacity depends on room temperature and aquarium conditions.\u003c\/p\u003e\u003cp\u003eSee \u003ca href=\"https:\/\/fluvalaquatics.com\/us\/shop\/product\/m200-submersible-heater-200w-up-to-65-us-gal-200-l\"\u003eFluval M200 specifications\u003c\/a\u003e.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":53814774857941,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/A784_packaging-1.webp?v=1778850157"}],"url":"https:\/\/tropicaltreasureswyo.com\/collections\/shippable-aquarium-heaters.oembed","provider":"Tropical Treasures Wyo LLC","version":"1.0","type":"link"}