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Thread: Heater (Pool or Spa) Cost of operation of Propane heater

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    mnittler's Avatar
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    Heater (Pool or Spa) Cost of operation of Propane heater

    How do I calculate the fuel cost of operation of a spa or pool propane heater? Last Saturday I routed my spa heater to the pool and raised the temperature of the pool 14 degrees in 6 hours to make it tolerable to swim. The heater never reached setpoint so it was on the entire 6 hours.
    My spa propane heater is rated 400,000 btu.
    Assume $2.35 per gallon of propane
    How do you calculate the gallons of Propane used per hour?
    21,500 gal sport pool, 8' spa, beach, 400k btu LP heater, Pentair IC60 SWG & #300 Tablet Feeder, 60 sqft DE filter, Paramount in-floor PoolValet 3 cleaners, Debris Canister, Polaris 360, Pentair VFD 3hp pump, IntelliPh, Geysers & Turbo Twister Slide w/1 hp pump, Color LED Pool & Spa lights, E-Z Touch8 control system, Wireless controller. Test Kits:TF-100, Taylor K-1004, CYA K-1720, Phosphate K-1106, Salt Water K-1766, Hach CN-39WR.

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    Mod Squad jblizzle's Avatar
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    Re: Heater (Pool or Spa) Cost of operation of Propane heater

    I think it is close to this:
    1 gallon propane = ~ 92,000 BTU
    Heater = ~400,000 BTU/hour

    So in 6 hours, you used 2,400,000 BTU / 92,000 = 26 gallons of propane = $61

    Your specific question: 400,000 BTU/hr / 92,000 BTU/gallon = 4.35 gallons / hr ... assuming the heater stays on the entire time
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    Mod Squad Bama Rambler's Avatar
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    Re: Heater (Pool or Spa) Cost of operation of Propane heater

    JB beat me but our answer is the same.

    The heater is rated for BTU/H so in 6 hrs you used 2,400,000 BTU's or about 26 gallons of propane.

    Propane has about 91,500 btu per gallon so that heater will use about 4½ gallons per hour
    Dave J. TFP Moderator
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    mnittler's Avatar
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    Re: Heater (Pool or Spa) Cost of operation of Propane heater

    Thanks for the input. I guess using cowboy arithmetic I can pretty well assume $10/hr in 2013 propane prices of $2.35 in my area. Part of the cost of enjoying a pool.
    I don't know if it is or ? The kids and grand kids (14 swimmers in all) are still talking about swimming when it was cold outside. Memories are forever.
    21,500 gal sport pool, 8' spa, beach, 400k btu LP heater, Pentair IC60 SWG & #300 Tablet Feeder, 60 sqft DE filter, Paramount in-floor PoolValet 3 cleaners, Debris Canister, Polaris 360, Pentair VFD 3hp pump, IntelliPh, Geysers & Turbo Twister Slide w/1 hp pump, Color LED Pool & Spa lights, E-Z Touch8 control system, Wireless controller. Test Kits:TF-100, Taylor K-1004, CYA K-1720, Phosphate K-1106, Salt Water K-1766, Hach CN-39WR.

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    Christian's Avatar
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    Re: Heater (Pool or Spa) Cost of operation of Propane heater

    Sounds like the party was a hit so I'd go with over !

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