{"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":"Tropical Treasures Wyo LLC","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\/EHM36135-2T.jpg?v=1785069377","url":"https:\/\/tropicaltreasureswyo.com\/products\/eheim-thermocontrol-jager-75w-aquarium-heater","provider":"Tropical Treasures Wyo LLC","version":"1.0","type":"link"}