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Thread: OK to bypass heater completely?

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    OK to bypass heater completely?

    I recently got my pool and spa remodeled and added a Pentair gas heater. I also have a roof-top solar heater. Presently the piping is setup to always go through the gas heater, though I can isolate the solar heater. My thought was to set it up so that I can bypass the heating system altogether for times when I am not going to be heating so as to minimize pumping losses. However, when I asked my pool guy about this, he said that (1) heaters typically aren't bypassed and (2) it could be problematic to leave water in the heater core.

    So, my question is: is there any good reason to not bypass the heater completely if I am not concerned about the cost to do so? As a corollary, does anyone know how significant pumping losses are through the gas heater? If they are extremely small, then it's probably not worth it.

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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: OK to bypass heater completely?

    You may want to look at the plumbing advice here where they suggest bypassing a heater that is plumbed into the solar return line in order to minimize back pressure on the solar panels
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: OK to bypass heater completely?

    I think there should continue to be some flow through the heater to avoid stagnant water. But you can still bypass a good portion of it to lower headloss.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    In the Industry

    Join Date
    Nov 2011

    Re: OK to bypass heater completely?

    There is no reason that you couldn't bypass your heater entirely. Just be sure your ph and alkalinity are in range.
    Over 30 years in the pool business
    We build vinyl, fiberglass, stainless steel pools
    Certified in Hydraulics

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    Re: OK to bypass heater completely?

    youd be ok to bypass the heater

  6. Back To Top    #6

    Join Date
    May 2013
    Ontario, Canada

    Re: OK to bypass heater completely?

    I dont see an issue bypassing the heater. I would blow the lines out of the core with the system shut down similar to a winterizing method.
    18' x 36' vinyl steel wall pool with deep end, 2 lights and 6' steps, main drain, SWG, Cartridge Filter, 320,000 BTU Rheem heater, 3/4HP 1 stage pump - Ontario, Canada

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