Heater calculator? - The Planted Tank Forum
Old 02-17-2014, 10:58 PM Thread Starter
Algae Grower

Join Date: Oct 2013
Location: Redmond, WA
Posts: 87
Heater calculator?

Does anybody know of a heater calculator?

What I want to figure out is how much time x watt would take to heat y gallons of water by 10 degrees.

I found plenty of calculator that tell me that I need x watt for a y tank if my ambient temperature is z degrees. What I want to calculate is to see how quickly I could heat 40F water to 78F using aquarium heaters (this is for doing water changes using the sump).

Last edited by Paul.Gitter; 02-17-2014 at 11:01 PM. Reason: clarification
Paul.Gitter is offline

Old 02-17-2014, 11:12 PM
Planted Tank Guru

Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
http://hyperphysics.phy-astr.gsu.edu...useenergy.html

Scroll (short ways) down to Water Heater. Near the bottom of this box might be a calculator you could use.
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Old 02-17-2014, 11:33 PM Thread Starter
Algae Grower

Join Date: Oct 2013
Location: Redmond, WA
Posts: 87
thank you - the formula was what I was looking for.

y = gallons of water
z = temp delta
x = watt

(1 BTU/lb °F)(y*8 lb)(z °F)*0.2931 w/btu = x watt

This means to heat my 30 gallons in the sump from 40F to 70F I need 2100 watts.
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