how do you decide what size heater

Wetzel

Member
How do you decide what size heater to put in your tank? I have heard its better to put 2 or 3 small ones than one big one is that true and why?
 

e_watson09

Member
I just use one that is the right size for my tank. I do understand why you would put two smaller heaters, you could put one on each side of the tank so that you don't have one side that gets more heat than the other.
 

phishyitis

Member
5-10 gal 50watt/20-30gal 100watt/55gal 200watt/75 300watt/ not my opinion just what I read off the box.
 

Cichlidude

Member
All depends on what the temperature difference you are trying to overcome.

Heater Guide Example:

If you need to raise the temperature of a 55 gallon tank 15 F, simply use the guide below to find out what wattage is needed. The corresponding wattage is 190 watt, therefore you would select a 200 watt heater. For me, my downstairs theater room may get down to 60 at night for my 75 gallon. Therefore a 300 watt heater is used.

DeltaT____10F____15F____20F____25F
Gallons-------------Watts----------------
10________53____80____106___133
20________80____120___160___200
30________93____140___187___233
40________107___160___213___265
55________127___190___253___316
75________147___220___293___367
90________160___240___320___400
120_______180___270___360___450
150_______200___300___400___500
180_______213___320___425___533
200_______220___330___440___550
250_______233___350___467___583

Worse case is probably in the winter. Right now my 300 watt unit is totally turned off as my house is around 75 degrees.
 
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