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Thread: Heater Plumbing Inquiry

  1. Back To Top    #1

    Join Date
    Jan 2014
    Miami, Florida

    Heater Plumbing Inquiry

    Hi forum,

    I will be attaching a heater to my system and will add (2) 3-way valves to the system by way of "H" set up. I was under the assumption that a check valve would be needed prior to the SWG but I am being told that if I am adding the 2 valves a check valve is unnecessary. This would support if I was only adding one 3 way valve a check valve would be needed to prevent back flow. Does the board agree?
    17' X 34' Pool w/ Spa Gallons: Pool 16,200 Spa 950
    In Ground Concrete w/Diamond Brite finish
    Jandy Cartridge Filter
    Jandy 2 Speed 2 HP Pump 100 GPM
    Autopilot SWG

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

    Re: Heater Plumbing Inquiry

    There are many ways to plumb a heater bypass. It really depends on what you are trying to do.

    If you are trying to bypass the heater when the heater is not in use to improve system efficiency, all you need is a simple two way valve on the bypass pipe.

    If you are trying to allow the heater to be isolated so it can be serviced, then you need one three way valve and a check valve. Some people prefer to use three simple on off valves for this same setup, one on each connection to the heater and one on the bypass pipe. You can also get the same effect with two three way valves.

    If you are bypassing the heater because your pump flow rates exceeds the max flow rate for the heater, the you need a spring check valve on the bypass pipe.

    I can't think of any reason to have two three way valves and a check valve.
    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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