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Thread: Heating cost

  1. Back To Top    #1

    Join Date
    Apr 2015
    Chesterfield, mi

    Heating cost

    thinking about trying to heat pool this weekend. temp should be 70 degrees each day, 55 at night. current pool temp is 55.

    Does math below make since/sound right?

    Total Gallons = 18500

    Wind Speed Average = 3.5 MPH

    Desired Temperature Rise = 20 degrees

    Heater BTU's = 200000

    Heater Efficiency = 80%

    Fuel Cost per therm = $.35

    Our calculations based on your information shown above are as follows:

    Total therms required = 38.53

    Time (in hours) to raise 18500 gallons of water 20 degrees = 19.26

    Time (in minutes) to raise 18500 gallons of water 20 degrees = 1155.79

    Cost to raise 18500 gallons of water 20 degrees in 19.26 hours @ $ .35 per therm = $13.48
    34x18 doughboy (desert springs) above ground. Has deep end, but don't know depth yet. Pool came with house (first season). 22in sand filter (250lbs sand)with 1.5hp two speed pump. Pentair MiniMax ch 200m heater.
    440 gallon Emerald spa. Currently a 3.6hp, 2 speed, 46y, 240volts motor. Changing to a 3hp, 2 speed, 56y, 240volt motor.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Heating cost

    That is all roughly correct. The real world is somewhat viable, so actual may be more or less, but that is a good ballpark number.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Heating cost

    Do you plan on swimming in 75F water? Also do you have a cover? Otherwise it might take longer. You could lose 0.25 to 0 5 deg per hour in heat loss without a cover.
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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