I have this heater in an 8.5 gallon tank. Ambient temperature 68°. The tanks sit on a granite countertop. As long as the heater is on I can't say it works too well. First, when you get the heater, ignore the temperature controller at the top. It's absolutely useless. If I set it to 78° my tank would be 85°+. Even after I set the cut-off temperature to 78, the temperature fluctuates between 72° and 78°, which makes me a little uncomfortable. I do not recommend this if you are keeping fish with sensitive temperature requirements. From the looks of it, that 6 degree window is barely enough for the few guppies, tetras, shrimp, and plants I have. I'll probably put in a replacement thermostat to more precisely control the temperature.
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