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Thread: Suction Air Leak from Heater

  1. Back To Top    #1

    Join Date
    Jul 2007
    Rockville, CA

    Suction Air Leak from Heater

    Discovered a typical "suction-side" air leak that appears to be coming from the heater. It doesn't appear to be coming from the inlet or outlet unions, and water does not appear to be leaking from the unit as the filter runs. Haven't tried to run the unit since I discovered the leak, as I don't want to cause further damage. I have basic mechanical aptitude, but electrical and gas repair skills are not in my bag of tricks (though I did successfully replace the main circuit board). My wife doesn't want me to attempt a repair, but I would like to know what I can do to try to diagnose the problem or who I might contact...a plumber or electrician...I would like to check it myself out before I call someone.

    Is there a safe way to remove the heater cowling and run the filter to get a view of the uniit's operation? Are there any typical areas to observe that might be the cause of the problem? Do I get out the socket set or call...somebody?
    20K inground gunite w/ Aqua Logic automation and chlorination Sta-Rite 400 K natural gas heater and cartridge filter 2 HP pump 1.5 HP spa bubbler for spillover spa 1 HP dedicated Letro Legend cleaner
    H2O: two parts Heart and one part Obsession. ~Author Unknown

  2. Back To Top    #2

    Join Date
    Jun 2013
    SpringHill FL

    Re: Suction Air Leak from Heater

    Your heater is before your pump?
    15x30 gunite 18k gallons Hayward star clear plus 120sqft cart

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Suction Air Leak from Heater

    Isn't your heater installed on the pressure side of your system?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Jun 2012
    western NY

    Re: Suction Air Leak from Heater

    I am somewhat confused on this as to me a suction side air leak would come before the filter pump and not after it. Anything after the pump will be pressure and will squirt/drip water out instead of pulling air in. Your heater should be on the pressure side unless it was hooked up different than I am accustomed to seeing.

    If it is dripping water out, you need to determine where it is coming from. If it is a pipe union it may/should be able to be tightened. If it is something else such as a hole in a pipe or the heat exchanger then more specialized work will need to be done.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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