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Thread: Heater install....bypass line ?

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    Heater install....bypass line ?

    Installing a heater this weekend. Should I install a bypass line for when the heater is not in use ? Ive heard yes and no but can someone explain the pros and cons.

    Thanks the site..learning so much

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    Heater install....bypass line ?

    I don't know the pros and cons but I don't have a bypass line, I just have a shutoff valve and no issues
    18' x 33' Aqua leader AGP (~19k gal) w/hayward swimpro voyager cartridge filter and 2hp hayward pump.
    8 Gal LQ, hayward heater.

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    Re: Heater install....bypass line ?

    Thanks for the response....its possible I may have confused...Im talking on the water side. A bypass line for water to bypass the filter when not in use to continue to run the pump and filter.

    I understand that I can just turn off the heater when not in use but continuing to run the water through the heater will limit the life of the heater. ( ?)

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    XsAllOverIt's Avatar
    Join Date
    Dec 2010
    Mount Airy, Maryland

    Re: Heater install....bypass line ?

    I don't think it will limit the life of the heater to run water through it all the time. To the contrary, stopping the flow of water through the heater would probably shorten the life of the heater more if you take into account that there is salt in the water and letting the heater dry up would certainly create some corrosion. Having a bypass would be effective if you ever had to do repairs on the heater, but you could certainly create a bypass when and if that happens. I don't have a bypass for my heater and run the heater pretty infrequently.
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

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    TripleB4me's Avatar
    Join Date
    Jun 2007

    Re: Heater install....bypass line ?

    I have a bypass for the heater so if/when I need to replace it no worries. It's very easy to do and you won't have to worry about it later.
    20x40 IG Vinyl, 1.5 HP Whisperflo, Sta-Rite System 3 (300) Sq. ft Cart
    Intellichlor IC40 SWCG, 125,000 BTU Pentair heatpump, Polaris 280
    7' IG FG Spa, 2 HP Whisperflo, Pentair Dynamic III Cart (100) Sq. ft

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Heater install....bypass line ?

    The advantage to having a bypass is that your system will run more efficiently when the heater is bypassed. The disadvantage is that a bypass means more parts, which means more ways for things to fail and more ways to make mistakes. For example, certain incorrect settings on a bypass can damage the heater (i.e. turning the heater on with one side on and the other off).
    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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