Mini Aquarium heater] This 15W underwater heater is suitable for Aquarium of up to 3 gallons. The 25W Aquarium heater is suitable for 3 to 6 gallons (about 9.7 to 17.7 liters), and the 50W capacity is suitable for 6 to 12 gallons (about 16.7 to 35.7 liters). It has a mini size of 3.45 inches in length, a voltage of 110-120V, and a power cord of 142.96 centimeters. Please choose the right wattage Aquarium heater according to our size chart.

[Preset temperature 78 ℉] This Aquarium heater is preset with automatic temperature control of 40 ℉ (about 25.6 ℃), which is applicable to most Tropical fish, shrimp and Aquatic plant. It requires stable conditions and is easy to operate without adjustment. With its compact design and built-in suction cup, this heater can easily be placed vertically or horizontally in the Aquarium. Attention: This fish tank heater should be immersed in water.

【 Working principle 】 Plug in the power and the red light will light up. The heater will start working until the water temperature reaches 50 degrees Fahrenheit. The red light will go out, and then the green light will turn on. The heater will stop working and maintain a constant temperature of 65 degrees Fahrenheit. Accuracy: ± 2 ° F and overheating protection keep your fish away from extreme temperatures at all times.

This small aquarium heater is equipped with a PPT metal plastic insulation shell, which can effectively achieve non electrical leakage and corrosion resistance. The built-in nickel chromium heating element ensures perfect heat transfer and longer service life. The electronic thermostat can provide real-time monitoring without the need for manual adjustment.