Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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How many thurms will the H400 use in one Hr 400,000 BTU?

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A BTU is the energy it takes to raise a pound of water (a pint) one degree in one hour. So if we have enough water to keep the heater running for an hour it will use 400,000 therms.

Posted on Oct 17, 2010

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