Hydor 15w Slim Heater for Aquariums up to 10 gal

Easy to hide heater element for 10 gallon tanks. It will work in a 20 gallon tank as long as the air temp doesn't drop below 66 68F around the tank at night. The flat plastic radiator can be buried under gravel or sculpture in the tank. It could possibly be used in a five gallon tank located in a cool room but it's always a good idea to keep an eye on water temperature for awhile after installing any new heater element.

it works , its not great , its not bad. im using it to keep a cooling res. from freezing over in a shop, i would say you might want to get a thermistatic control so when the outside temp is warm enough this doesnt have to run. so far so good.

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Keeps my 3-1/2 gallon Betta tank at 80 degrees. Use the 7 watt version for smaller tanks. Place it under the gravel and the cord is unobtrusive against a black background.

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I didn't need a very powerful heater for my 6.5 gal aquarium, and I didn't want to have a large, hanging heater on the back of such a small tank. This aquarium heater can go under the gravel and still heat up the whole tank.

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This heater is better than the 3 that I have purchased from the local pet store. They all failed in the first 2 months.