10W Betta Heater - for Small Tanks (1.5 gal.) - Fully Submersible Aquarium Heater - Automatically Reaches Preset Temperature - Energy-efficient Heating Module - Suction Cups for Easy Installation

What size tank is this SunGrow Aquarium heater used for? The size of the water heater is 13.5*2.5*1.7 inches. This has enough power to heat up max 3.5-gallon tanks. If you have a bigger tank consider using a different SunGrow aquarium heater. The heater runs between 8-13 W. You can easily install it against the aquarium window. Why is a fully submersible heater better than half submersible? The fully submersible heater gives the aquarium hobbyist more freedom to place the heater wherever they prefer in the tank. Each aquarist will decide on the ideal placement of the heater. The heat will circulate due to the flow of water from your filter. Ideally, your filter will thoroughly mix the water to prevent any torrid or cold zones creating a calm and tranquil habitat for your betta fish. How will this heater help with energy conservation? This heater has a very efficient heating module, which can transfer the electrical energy into heat energy at a rate that is 20% higher than the traditional heating rods. It is more resilient than traditional glass sleeve heaters. How safe is this for my betta fish? The heating rod is 100% safe to be submerged in your fish tank. The extra strength engineered plastic keeps your fish away from the heating element and prevents any exposure or collision with the actual heat source. It also has an Auto Shut-Off feature. So if the aquarium is overheated, it shuts off automatically and resets when it cools down. Precautions: