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Thread: Regular Home Tankless Water Heater to heat pool?

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    Join Date
    Jun 2014
    Toronto, ON, Canada

    Regular Home Tankless Water Heater to heat pool?

    Hi all,

    I was just wondering if it would be possible to heat the pool water with a regular tankless water heater used in homes? I was thinking I could just plumb it with the correct valves to either heat house water or the pool and use the pool pump to pump the water through the heater.

    What do you think? Is this a really dumb idea?


    Nevermind, I found this:

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Regular Home Tankless Water Heater to heat pool?

    I'd mostly be concerned about the number of BTUs that tankless heater is capable of. Wouldn't be worth it if it is a low number and you have to run it for a week solid to get 5 degrees out of the pool temperature rise.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Mike_W's Avatar
    Join Date
    Aug 2011
    Orange County, California

    Re: Regular Home Tankless Water Heater to heat pool?

    I would make sure that your pump doesn't exceed the water heater's max flow rate. My Noritz Tankless water heater is rated at 8.4 gal/min max while my pump can move lots more water.
    I'd also be conserned about running pool water through part of your drinking water plumbing.
    ~17' x 34' IG pool with attached spa - 20500 gallons - Gunite with a "pebblesheen"-ish finish
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    AquaRite SWCG - Pentair SMBW 4060 DE Filter - Really Old Raypak heater
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  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Regular Home Tankless Water Heater to heat pool?

    Home water heaters are not designed to handle the chemical levels in pool water nor the flow rates used with swimming pools. They are also normally way too small for use with a swimming pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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