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  1. #1
    Join Date
    Jul 2010

    Default Central AC and Water Heater

    Every time my Central AC unit comes on while my gas water heater
    is on the AC unit pulls the water heater exhaust back through
    the vent pipe and into my house. Is there anything I can do?

  2. #2
    Join Date
    Aug 2007
    The Great White North

    Default Re: Central AC and Water Heater

    It appears your home is going into negative pressure when the A/C is running.
    There is not enough air within the area of the hot water heater to main enough upward draft in the fluse during combustion.

    Is the A/C part of a forced air furnace that located by the water heater?
    Is the water heater and air handler in an enclosed room?

    You should call an HVAC professional to come out and evaluate what's causing the negative pressure that creates backdrafting of your gas water heater.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Aug 2007

    Default Re: Central AC and Water Heater

    Good advice. also get a CO detector if you don't already have one.

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