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  1. #1
    Join Date
    May 2006
    Location
    Bedford,Ohio
    Posts
    27

    Cracked heat exchanger

    Neighbor had his furnace replaced because service man told him it had a cracked heat exchanger.
    I asked if I could have the old furnace for parts.
    I just wanted to test the heat exchanger.
    I laid the furnace on its back and filled the heat exchanger with water.
    Does not leak a drop.
    Is it possible to have a cracked heat exchanger and still hold water?
    thanks,
    david

  2. #2
    Join Date
    Dec 2004
    Location
    Grand Rapids, MI
    Posts
    619
    whats the model ? and age ?
    Could be failed and not cracked, like a plugged secondary giving off high CO readings.
    luck dan

  3. #3
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    Quote Originally Posted by 6t7gto View Post
    Is it possible to have a cracked heat exchanger and still hold water?
    No.

  4. #4
    Join Date
    May 2006
    Location
    Bedford,Ohio
    Posts
    27
    Marty,
    thanks for the reply.

    david

  5. #5
    Join Date
    May 2006
    Location
    Bedford,Ohio
    Posts
    27
    BTW it is a lennox 1991

  6. #6
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    G20? If so they crack on the back side,first bend above the burners. Usually they'll show a rust line stress mark inside the exchanger at that spot for a few years then it goes all the way through. I have a couple on the first heat exchanger but most are on round two.

  7. #7
    Join Date
    Mar 2010
    Location
    NJ
    Posts
    327
    Just like a leak in any piece of metal, the crack can calcify or crust over and not actively leak. A water test is not always definitive.
    ecuacool
    732-494-HELP
    http://ecuacool.com

    Guaranteed energy savings.
    Serving all of NJ, NYC, and eastern PA.

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