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What size heater for a 20 gallon?


AJE
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I do 2-50w on my 20 long one at each end both near a flow positioned on an angle.  I never have fluctuations but I did have one quit and was great full I had two. How many or what watt you should have I could not tell you but this set up works for me on anything over 10 g

 

ADORABLE Iguana  BTW very striking green. 

Edited by Guppysnail
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Useful chart…

4560BD3C-41DD-4602-8ADE-F36384ED7D1D.jpeg.50b6cf78969a5cafe02c351ec1628dfc.jpeg

the “heats” listed is the amount you are trying to raise from ambient. 
For example, with a 20 gallon tank, if you are trying to achieve a temperature 9 degrees above ambient, it would require 50 watts.  18 degrees requires 75 watts, and so on.

BTW - the dual heater method (lower wattage) is a great fail-safe when heat is critical - as @Guppysnail suggested.

Edited by tonyjuliano
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