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  1. #1
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    Mar 2007
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    Spring Hill (Nashville), TN
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    Default PEX supporting an expansion tank

    I need some help. I searched through the ZURN PEX install manual and I could not locate a proper way to attach and support an expansion tank at a water heater. My gut is telling me that this is not kosher.

    Anyone have any documentation that might cover this?

    Oh, and that line running out of the wall is a bonding wire for the PEX system in the home!

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    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  2. #2
    Join Date
    Mar 2007
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    Plano, Texas
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    Default Re: PEX supporting an expansion tank

    5. Install the expansion tank in the system (Refer to Fig. 1).
    a. The weight of the expansion tank fi lled with water is sup-
    ported by the system piping. Therefore, it is important
    that, where appropriate, the piping has suitable bracing
    (strapping, hanger, brackets).
    From the Watts site http://www.watts.com/pdf/1915356.pdf

    They show a strap on the tank in one position.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
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    Ormond Beach, Florida
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    Default Re: PEX supporting an expansion tank

    Where is the T&P relief valve?

    Where is the disconnect?

    Where is the space between the water heater and the wall for the pan?

    The flexible metal conduit is not strapped within 12" of the connector at the water heater end (typically these are screwed to the water heater outer housing top).

    Jim is correct, Watts tells you how to support the expansion tank, and that photo shows *how not to do it*.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4
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    Mar 2007
    Location
    Philadelphia PA
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    Default Re: PEX supporting an expansion tank

    Can you run Pex right down to the water heater, or is the first 18 inches(?) supposed to be copper?

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  5. #5
    Join Date
    Aug 2007
    Location
    Memphis TN.
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    4,311

    Default Re: PEX supporting an expansion tank

    Quote Originally Posted by John Arnold View Post
    .
    is the first 18 inches(?) supposed to be copper?
    .
    Yes If it's a Gas Fired appliance.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  6. #6
    Join Date
    Mar 2007
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    Orlando, FL
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    1,339

    Default Re: PEX supporting an expansion tank

    Quote Originally Posted by Jerry Peck View Post
    Where is the T&P relief valve?

    Likely on the front, as many newer units have them down there.


  7. #7
    Join Date
    Mar 2007
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    Spring Hill (Nashville), TN
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    Default Re: PEX supporting an expansion tank

    Quote Originally Posted by Jerry Peck View Post
    Where is the T&P relief valve?

    Where is the disconnect?

    Where is the space between the water heater and the wall for the pan?

    The flexible metal conduit is not strapped within 12" of the connector at the water heater end (typically these are screwed to the water heater outer housing top).

    Jim is correct, Watts tells you how to support the expansion tank, and that photo shows *how not to do it*.
    T&P is on the side.

    Disconnect is at the panel about 4 feet away(with a lockout)

    AHJ does not require a pan for units in a garage that is below the floor level of the home. Yet they require the PEX to be bonded! I always recommend a pan if one is not present.

    Yep, the conduit is not secured as you stated. I don't see that as an issue.

    Thanks Jim for that Watts link. I used that diagram along with verbaige about proper support of PEX pipe.

    Last edited by Scott Patterson; 01-07-2009 at 07:53 AM.
    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

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