Durable Quality Aquarium Heater: This fish tank heater is constructed with explosion-proof quartz glass and high-temp resistant nickel-chromium, featuring fast thermal conductivity and efficient heating. Protect shell is made of PC plastic, prevent your fish from burning.

Overheating & Anti-Dry Protection: the aquarium heater stops if the water temperature exceeds the set point by 1°F/1°C. If it rises rapidly by 3°F/3°C, the display will flash the current temperature and stops heating. If the heating rod is more than 1 inch out of the water, it shows an "E0" error code and stops heating. This ensures a safe and comfortable environment for your fish.

Intelligent Automatic Heating: The AQQA fish tank heater adopts automatic constant temperature control. When water temp reaches the set temp, it will stops heating; when the water temp falls lower than the set temp by 2℃/°F, it will automatically heat up again; Memory function allows no need to reset the temperature after a power outage, so it is more convenient to unplug and change the water.

Safe and Easy to Use: Adjust the temperature with the external controller. Press the “SET” button to enter temperature settings, increasing the set temperature by 1°F/1°C with each press within a range of 59°F to 93°F (15°C to 34°C). Long press for 5 seconds to switch between Fahrenheit and Celsius.

Kindly Note: Fully submerge the aquarium heater in water before plugging it in and ensure good water circulation in the tank. After turning it off, let the heater cool in the water for 15-30 minutes to prevent any residual heat from damaging the shell. For any issues, feel free to contact us.