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Thread: Valve position when heating pool with heat pump

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    Valve position when heating pool with heat pump

    When heating I can open/close a valve which would either force all water through the heat pump or allow 50% to bypass it. Is there a clear advantage to forcing all water through it (ie, it heats substantially faster)? I'm assuming the increased pressure is a negative for everythinig else, and if I'm going to run this for several days straight to get the whole pool heated up, I'd prefer not to impact filtration, etc.
    ~17,000 Gallons, IG-pebble, DE, SWG

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Valve position when heating pool with heat pump

    For the most efficient heating, you want the flow rate through the heater to be just a little below the maximum design flow rate for the heat pump. Unfortunately, what setting on the valve will get you that flow rate is tricky to determine.
    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

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    Join Date
    Mar 2008
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    Central VA
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    328

    Re: Valve position when heating pool with heat pump

    My PB plumbed my heat pump so that all water flows through it, for whatever reason...but it does heat pretty well when it's on for an extended period of time...get a solar cover if you don't have one, you'll save hundreds of bucks.
    Todd
    --------------
    Pool: 16x36, 16,800 gal., vinyl, sand filter, SWG & AquaCal Heat Pump
    Spa: Hot Springs Sovereign, 355 gal., ozone/ion
    The most helpful tool you'll ever have for your pool:
    http://www.poolcalculator.com/

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    spishex's Avatar
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    Oct 2008
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    Hillsborough, NC
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    Re: Valve position when heating pool with heat pump

    Most heat pumps have a built-in bypass for excess flow, so if you're unable to determine your flow rate then I'd default to max flow to the heater to prevent any low flow / high pressure problems as described in this thread.

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