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octagon 05-05-2012 06:26 AM

Water heater for infloor?
Can we use a standard water heater to source our 850ft of infloor radiant heat system? Pex in cement, dedicated heater tank, custom DIY built manifold with 3 pumps for the three zones. Appreciate any thoughts, hope to avoid the cost of a condensing boiler, at least for now.:: we live in the Northern region

Jackofall1 05-05-2012 07:00 AM

I would have my doubts that a single standard water heater could keep up with the heat load produced, so parallel tanks would be required (again depending on the heat load), I believe a standard 40 gal tank has a 30K Btu/hr burner in it.

Another issue may be the pressure / temp relief valve, depending on what pressure your pumps develop to circulate the water. This could be mitigated by putting the tanks on the return side of the heating loop and the pumps on the supply side, so you are pulling through the tanks.

Seems like alot of work to go through and not put the proper heating source on it.


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