AJE Posted June 16, 2021 Share Posted June 16, 2021 I don'r have much experience with heaters but I think I'll need one for my future multi's tank. What size heater would I need to heat a tank to 77ish degrees? Link to comment Share on other sites More sharing options...
Nate s Posted June 16, 2021 Share Posted June 16, 2021 Depends on location. If it’s in a cool basement maybe a 100watt. If it’s upstairs a 50w would be fine. Link to comment Share on other sites More sharing options...
Guppysnail Posted June 16, 2021 Share Posted June 16, 2021 (edited) 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 June 16, 2021 by Guppysnail 1 1 Link to comment Share on other sites More sharing options...
tonyjuliano Posted June 16, 2021 Share Posted June 16, 2021 (edited) Useful chart… 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 June 16, 2021 by tonyjuliano 2 1 Link to comment Share on other sites More sharing options...
StevesFishTanks Posted June 16, 2021 Share Posted June 16, 2021 I use 50w in my 10s and 20s Link to comment Share on other sites More sharing options...
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