Google Aquatop guarantee and search for: Note. All sales through Revain and Ebay (regardless of seller) are not guaranteed. See Where to Buy for more information. The heating worked, but allowed temperature fluctuations of six to eight degrees. I bought 300 watts for a 29 gallon tank so it could be argued that once the heater was turned on it raised the water temperature so quickly that when the element turns itself on and off it's still hot and temperature elevated. But the most disappointing thing was that the water temperature was much lower than the set temperature but the heater didn't turn on. I learned my lesson and in the future I will buy heaters with a guarantee.
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