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Thread: Anti Freeze protocol question

  1. Back To Top    #1

    Anti Freeze protocol question

    I live in central California in a location that can dip below 32F on occasion. The previous homeowner downplayed this and just indicated that on the nights that are forecasted to dip below freezing, he would run the pool pump for a few hours during the coldest part of the night. Well this is easy enough to accomplish on the main pump, put the spa pump is not on a programable timer. The separate spa pump is in a closed circuit that goes through a gas heater....which is the component that I am worried about.

    There is a drain valve on the heater manifold to drain the water out of the heat exchanger, but based on the layout of the pool/spa (spa spills over into the pool) the drain valve is actually lower than the water level in the the spa water drains out of the heater valve when the drain valve is opened.

    There is not an easy way to disconnect the heater from the circuit and close off the pipes, just too many glued joints and splices.

    Any ideas or conventional wisdom to solve the dilemma and prevent water from freezing in the heater?

    55,000 gallon inground pool and with spa spillover
    Plaster finish
    Hayward DE filter with 1.5HP pump
    Build date -- 1997 +/-

  2. Back To Top    #2

    Join Date
    Feb 2008
    Flower Mound, TX

    Re: Anti Freeze protocol question

    What problems, if any, did the previous owner have with this and what did he do about it? If he has managed to avoid problems with freezing water in the heater since 1997, you will probably be ok continuing on what he has done. Especially since your temperatures don't get much below 32 degrees and not for very long.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

  3. Back To Top    #3

    Re: Anti Freeze protocol question

    I don't know any specifics, just what was in my original post. Last year I did not take any precautions and after the winter months I noticed that the header on one side of the heater was leaking ( a bulging crack the pool guy indicated was due to freezing water). I fixed it with JB Weld and is working great. the other side had the same sort of bulging crack, so I feel it is close to breaking through as well, so i need to do something. Since it is not on a timer, I feel like my options are:
    1. fire up the heater for a few minutes prior to going to bed just to keep the heat exchanger from dropping below freezing,
    2. on the suspect nights, run the spa pump all night to prevent freezing.

    I was hoping that others had tackled this problem previously....or maybe most in this situation have properly plumbed heaters so that they can isolate the heaters and drain them.

    Any ideas?
    55,000 gallon inground pool and with spa spillover
    Plaster finish
    Hayward DE filter with 1.5HP pump
    Build date -- 1997 +/-

  4. Back To Top    #4
    UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Mint Hill, NC

    Re: Anti Freeze protocol question

    Buy a timer.

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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