SICCE Jolly Preset 25W Plastic Aquarium Heater – Up to 6.6 Gallons
The SICCE Jolly Preset 25W Aquarium Heater is a compact, fully submersible heater designed for nano aquariums, small freshwater and marine systems, turtle tanks, terrariums, and paludariums. Its reinforced plastic casing provides a durable alternative to traditional glass heaters while allowing flexible placement inside small aquarium setups.
The electronic thermostat is factory preset to approximately 77°F, or 25°C, so no manual temperature adjustment is required. The heater automatically turns off when the preset temperature is reached and begins heating again when needed.
SICCE rates the 25-watt model for aquariums up to approximately 25 liters, or 6.6 US gallons. Actual heating performance depends on aquarium volume, room temperature, lid coverage, water circulation, and the difference between the room and desired aquarium temperatures.
Key Features
- Preset to 77°F: Electronic thermostat is factory set to approximately 77°F, or 25°C
- 25-Watt Output: Designed for nano aquariums up to approximately 6.6 gallons
- Reinforced Plastic Housing: Durable construction without an exposed glass heater tube
- Fully Submersible: Designed to operate completely underwater
- Automatic Temperature Control: Turns off when the preset temperature is reached
- Out-of-Water Protection: Thermal protection switches the heater off when it is not submerged
- Red Indicator Light: Shows when the heater is actively operating
- Strong Suction-Cup Mount: Helps secure the heater inside the aquarium
- Chew-Safe Cord Cover: Spiral cord protection provides added durability around turtles and reptiles
- Flexible Placement: May be installed visibly or placed beneath suitable aquarium gravel or sand
Product Information
- Brand: SICCE
- Product: Jolly Preset Aquarium Heater
- Model: Jolly Preset 25
- Power: 25 watts
- Recommended Maximum Capacity: 25 liters / 6.6 US gallons
- Preset Temperature: 77°F / 25°C
- Temperature Adjustment: Non-adjustable
- Housing: Reinforced plastic
- Installation: Fully submersible
- Indicator: Red ON/OFF LED
- Mounting: Suction-cup holder
- Approximate Length: 6.3 inches
- Approximate Maximum Diameter: 1.1 inches
- Approximate Cable Length: 6 feet
- Aquarium Compatibility: Freshwater and saltwater
Best Used For
- Nano aquariums up to approximately 6.6 gallons
- Betta aquariums within the recommended capacity
- Small shrimp aquariums
- Desktop aquariums
- Small tropical community tanks
- Small quarantine or observation tanks
- Marine nano aquariums
- Turtle tanks
- Terrariums and paludariums with an appropriate aquatic section
Preset Temperature
The SICCE Jolly Preset 25W is factory set to approximately 77°F, or 25°C. It does not include a manual temperature dial or external controller.
This heater is best suited for aquarium inhabitants whose preferred temperature range includes approximately 77°F. Confirm the proper temperature range for every fish, shrimp, plant, turtle, or other animal before selecting a preset heater.
Some tropical species may require warmer water, while certain shrimp, cold-water fish, or seasonal setups may require cooler conditions. An adjustable heater is a better choice when a specific temperature other than 77°F is needed.
Recommended Aquarium Size
SICCE rates the 25W Jolly Preset for aquariums up to approximately 25 liters, or 6.6 US gallons.
The original estimate of 8 gallons is higher than the published capacity. Use the official 6.6-gallon maximum as the safer merchandising recommendation.
Heating performance varies according to:
- Amount of water
- Room temperature
- Open or covered aquarium design
- Water circulation
- Drafts and exterior walls
- Difference between room temperature and 77°F
A heater suitable for 6.6 gallons in a warm room may struggle in the same aquarium when the room is significantly colder.
SICCE Jolly Preset Sizing Guide
- 6W: Up to approximately 1.6 gallons
- 12W: Up to approximately 3.2 gallons
- 25W: Up to approximately 6.6 gallons
- 35W: Up to approximately 9.2 gallons
These are the published maximum aquarium capacities for the Jolly Preset series. Room conditions and aquarium design may require choosing a different wattage or an adjustable heater.
Installation Instructions
- Inspect the heater, cord, plug, suction cups, and plastic housing before installation.
- Do not use the heater if the cord, plug, or casing appears damaged.
- Attach the supplied suction-cup mount.
- Place the heater fully underwater.
- Position it where water can circulate around the heater.
- Create a drip loop in the power cord below the electrical outlet.
- Allow the heater to acclimate underwater before connecting power.
- Plug it into an appropriate outlet and verify operation using a separate aquarium thermometer.
Follow the included SICCE instructions for placement, operating depth, cleaning, and electrical safety.
Placement and Water Flow
Place the heater near gentle but consistent water movement from a filter outlet, internal filter, or circulation pump. This helps distribute warmed water throughout the aquarium.
Avoid placing the heater where decorations completely block circulation. Although the Jolly may be placed beneath gravel or sand, it should be installed according to SICCE’s instructions and remain accessible for inspection.
Can It Be Placed Under Gravel or Sand?
Yes. SICCE specifically states that the Jolly’s plastic casing allows it to be placed beneath aquarium gravel, making it especially useful in turtle and reptile setups.
Use only suitable aquarium substrate and avoid locations where heavy rocks or decorations could crush the heater or damage its cord. The heater should still be periodically inspected for damage and proper operation.
Red ON/OFF Indicator Light
The red indicator light shows when the heater is operating. It will turn off when the preset temperature is reached or when the thermal protection activates.
Normal cycling is expected. The indicator does not need to stay illuminated continuously for the heater to maintain temperature.
Automatic Temperature Shutoff
The preset model automatically stops heating when the water reaches approximately 77°F. Heating resumes when the temperature drops and additional heat is required.
The heater also includes thermal protection intended to stop operation when it is out of the water, helping reduce overheating risk.
This protection should not replace safe handling. Always unplug the heater before removing it or lowering the aquarium water level.
Use with Bettas
The Jolly Preset 25W may be used for bettas in aquariums within its published capacity, provided approximately 77°F is suitable for the setup.
Use a separate thermometer because betta aquariums can heat differently depending on room temperature, lid coverage, and filter circulation.
For aquariums substantially smaller than 6 gallons, a lower-wattage Jolly model may be more appropriate.
Use with Shrimp
The heater may be used in shrimp aquariums when the shrimp species is compatible with approximately 77°F.
Neocaridina often tolerate this temperature, although cooler conditions may be preferred in some setups. Many Caridina species can be more sensitive to warm water and reduced oxygen levels.
Research the requirements of the specific shrimp species and monitor the aquarium with a separate thermometer.
Use in Marine Aquariums
The Jolly Preset is designed for both freshwater and marine aquariums. Its compact plastic body can be useful in small saltwater quarantine tanks, nano systems, and other appropriately sized marine setups.
Regularly inspect the housing, cord, suction cups, and plug for salt buildup or damage. Disconnect power before cleaning.
Use in Quarantine Tanks
The heater may be used in small quarantine or observation aquariums when approximately 77°F is appropriate for the fish being housed.
Because the temperature is not adjustable, it may not be suitable for treatments or species requiring a different temperature.
Disinfect equipment between uses and avoid damaging the plastic casing or electrical cord.
Using a Separate Thermometer
Always use an independent aquarium thermometer with any heater.
A thermometer helps verify that:
- The heater is operating
- The tank is reaching the intended temperature
- The room is not too cold for the heater’s capacity
- The aquarium is not overheating
- Heat is being distributed evenly
Place the thermometer away from the heater for a more representative reading of the aquarium’s overall water temperature.
Water-Change Safety
Unplug the heater before draining water, rearranging decorations, cleaning the aquarium, or placing hands in the tank.
Allow the heater to cool before removing it. After reinstalling or refilling the aquarium, allow it to acclimate underwater before reconnecting power.
Never pull the heater from the aquarium by its cord.
Electrical Safety
- Use a drip loop below the outlet
- Keep the plug and outlet dry
- Use a GFCI-protected outlet when possible
- Do not handle the plug with wet hands
- Do not use the heater with a damaged cord or casing
- Do not cut or repair the power cord
- Unplug the heater before cleaning or removal
- Use indoors only
Cleaning and Maintenance
- Unplug the heater.
- Allow it to cool.
- Remove it carefully from the aquarium.
- Wipe away algae, mineral deposits, or debris with a soft cloth or sponge.
- Inspect the housing, cord, suction cups, and spiral cord cover.
- Reinstall the heater fully underwater.
- Allow it to acclimate before reconnecting power.
Do not use abrasive cleaners, sharp scrapers, or household chemicals.
Important Aquarium Heater Note
No aquarium heater should be considered completely fail-proof. Use a separate thermometer and check the temperature regularly.
The Jolly Preset 25W is rated for aquariums up to approximately 6.6 gallons and is not adjustable. Do not use it when livestock requires a temperature substantially different from 77°F.
Actual performance depends on room temperature, aquarium volume, lid coverage, and water movement. A larger aquarium or cold room may require a higher-wattage heater.
Frequently Asked Questions
What size aquarium is the SICCE Jolly Preset 25W designed for?
It is rated for aquariums up to approximately 25 liters, or 6.6 US gallons.
Is it recommended for tanks up to 8 gallons?
No. SICCE’s published maximum for the 25W model is approximately 6.6 gallons.
What temperature is it preset to?
It is preset to approximately 77°F, or 25°C.
Can the temperature be adjusted?
No. The Jolly Preset has a fixed electronic thermostat and no manual adjustment control.
Is the heater made from glass?
No. It has a reinforced plastic casing.
Is it fully submersible?
Yes. It is designed to operate fully underwater.
Does it turn off automatically?
Yes. The preset model stops heating when the target temperature is reached.
Does it have protection if removed from the water?
Yes. SICCE states that thermal protection switches the heater off when it is not submerged.
Does it have an indicator light?
Yes. The preset model uses a red ON/OFF LED indicator.
Can it be placed under gravel?
Yes. SICCE states that the reinforced plastic Jolly heater can be placed beneath gravel or sand when properly installed.
Can it be used in saltwater?
Yes. It is designed for freshwater and marine aquariums.
Is it suitable for betta tanks?
Yes, when the aquarium is within the recommended size range and 77°F is appropriate.
Is it safe for shrimp?
It may be used in shrimp aquariums when the species is suited to approximately 77°F.
Can it be used in turtle tanks?
Yes. SICCE specifically includes turtle tanks among the intended applications and provides a chew-safe spiral cord cover.
Should I use a separate thermometer?
Yes. A separate thermometer is recommended to verify the actual aquarium temperature.
Should it be unplugged during water changes?
Yes. Unplug the heater before lowering the water level, cleaning, or removing it.
Available at Tropical Treasures Wyo
The SICCE Jolly Preset 25W Aquarium Heater provides compact, automatic heating for freshwater and saltwater nano aquariums up to approximately 6.6 gallons. Its reinforced plastic body, preset electronic thermostat, indicator light, out-of-water protection, suction-cup holder, and chew-safe cord cover make it especially useful for small aquariums and turtle setups.
Visit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop SICCE aquarium heaters, thermometers, nano filters, air pumps, aquarium equipment, and temperature-control supplies.
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