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Thread: Burning out a heater using SWG--eek!

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    Burning out a heater using SWG--eek!

    My above ground, indoor exercise pool just blew out its heater. The Hayward people said the heat exchanger was damaged through the Aqua Trol SWG that were both made by Hayward. Is there anyone else with this issue? My pool guy uses only the sticks for chemical checking and I had heard that Ph issues can cause damage. He swore all was balanced but I now have a broken heater. Now I am not sure about replacing the heater and keeping the SWG or giving up on SWG which I really like....this is annoying and expensive...any help or condolences??? Thanks.

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    Re: Burning out a heater using SWG--eek!

    The SWG did not corrode the heater! If anything a SWG, raises the ph to being more basic, not more acidic.
    1971 San Juan Fiberglass pool 12,000 gallons
    New Pentair Whisperflow 1hp
    New Pentair FNS DE filter 64sq
    All 1.5" piping and no heater
    1 skimmer, 1 main drain, and 2 returns

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    Join Date
    Jul 2007
    Location
    Brisbane, Australia
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    874

    Re: Burning out a heater using SWG--eek!

    is your heater installed before the SWG, after the SWG or in parallel to SWG?

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    In the Industry

    Join Date
    Jun 2010
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    74

    Re: Burning out a heater using SWG--eek!

    That is the key question right there.
    I have heard many many times that if your chlorine source (SWG, erosion feeder, etc) is setup before the heater, the very-high level of chlorine at that point going through the line will damage your heater.
    * Responsible for the operation of 21 semi-private pools and spas at 11 locations, varying from 1,900L to 20,000L spas and from 13,000L to 200,000L pools.

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
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    Re: Burning out a heater using SWG--eek!

    sbnslp,

    Welcome to TFP!

    Please answer Strannik's question as it makes a big difference. The SWG is supposed to come after all equipment, including the heater:

    Quote Originally Posted by Strannik
    is your heater installed before the SWG, after the SWG or in parallel to SWG?
    As for an SWG increasing the risk of corrosion of a copper heat exchanger:

    Quote Originally Posted by vln
    The SWG did not corrode the heater! If anything a SWG, raises the ph to being more basic, not more acidic.
    It is not just a low pH that can increase the rate of metal corrosion, but also increased electrical conductivity from the higher salt level. Though the rate of increase would be small, it could push any marginal heat exchanger over the edge and is why some manufacturers recommend keeping salt levels lower (< 2000 ppm so not using an SWG) or using cupro-nickel or titanium heat exchangers.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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