Need a heater who many watts? [Archive] - Reef Central Online Community

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hoopersmom

01/14/2009, 08:21 AM

I need a heater for a new tank it's a 75gal with a 30gal sump. I am just not sure if I need like 2 200w or if I could go with 2 150w heaters.

RicksReefs

01/14/2009, 08:30 AM

5 watts per gallon = 525 watts of heaters.

token

01/14/2009, 08:34 AM

Is this for the 29g you have or for the 75g you are planning?

hoopersmom

01/14/2009, 09:31 AM

This is for the 75 gal

CIGDAZE

01/14/2009, 09:37 AM

I have a 75 gallon with 30 gallon sump, same as you. I have two 150W heaters and they keep up just fine.

token

01/14/2009, 09:40 AM

Two by 150w will do the job, if you are raising from a temperature of ~70º. I tend to go larger so I would use two by 250w to increase efficiency. This works in my head but I haven't ever run my "thought math" past someone for confirmation. (My thinking is that the 250w's run for less time, meaning less draw and better control. "It looks good on paper, Orville, but will it fly...?)