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Old 07-06-2009, 01:05 PM   #1
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Size of water heater for radiant heating


Hi everyone, in my workshop I have a 30x40 area that I put 3-300 foot loops of 3/4" tubing in the concrete floor. I was wondering if there is a formula to figure out how big of a water heater I would need to heat that. It is going to be a dedicated water heater, only for the floor heat. Also, i will probably keep it at around 65-70 degrees.

I have decided that I am going to go with an electric water heater, as the calculations I have had people do for me say that electric and gas are about the same price unless you go with a very high efficieny gas water heater.

Thanks! --Mark

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