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Pool Heater Sizing - CPO® Math Tutorial

Things to know about Heater Sizing

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A British Thermal Unit (BTU) is the amount of energy it takes to
raise the temperature of one pound of water 1 °F in one hour.

One gallon of water weighs 8.33 pounds. Therefore:

  • 8.33 BTU's will heat one gallon of water 1 °F in one hour.
The amount of BTU's necessary to heat water is given as:

  • BTU's = 8.33 x number of gallons x number of °F temperature rise.
Example:

  • How many BTU's are required to raise the temperature of an 1,100 gallon spa
    from 94 °F to 102 °F?


    Formula is BTU's = 8.33 x number gallons x number of °F temperature rise

    What is the temperature rise?
    From 94 °F to 102 °F is 8 °F temperature rise
    Number of gallons = 1,100
    BTU's = 8.33 x gallons x number of °F temperature rise
    BTU's = 8.33 x 1,100 gallons x 8 °F = 73,304 BTU's

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