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I would not use a heater of less than 100 watts for anything. The price difference is minimal between 50 watts and 300 watts. Basically it is only the comparative physical size of the tank and the heater that decides how 'big' a heater should be. My usual surmise is "bigger is better" because it will not have to work as hard or as long as a smaller wattage one.

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Q: How many watts should a heater have to heat a 20 gallon tank and what about a 15 or 10 gallon?
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