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  1. #1
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    Default Water Heaters and Expansion Tanks

    I see some new water heater installations with expansion tanks installed and some without. Is there any requirement to have an expansion tank with water heaters?

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    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  2. #2
    Join Date
    Sep 2008
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    Default Re: Water Heaters and Expansion Tanks

    Anytime you have a closed system then you must install a expansion tank.

    A closed system could be caused by a check valve in line that does not allow the water to expand while being heated. The water has to expand somewhere so you install a expansion tank to allow for thermal expansion. Without a expansion tank there could be enough pressure that would cause pipes to start leaking, faucets that leak etc.

    Make sense????


  3. #3
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    Default Re: Water Heaters and Expansion Tanks

    Yes, makes sense. But installations have not always been like that. When were expansion tanks required?

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  4. #4
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    Sep 2008
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    Texas
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    Default Re: Water Heaters and Expansion Tanks

    I believe....... I don't know I'm not where I can research your question... Hopefully someone else will chime in!


  5. #5
    Join Date
    Mar 2008
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    Charlotte NC
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    Default Re: Water Heaters and Expansion Tanks

    Quote Originally Posted by Nick Ostrowski View Post
    Yes, makes sense. But installations have not always been like that. When were expansion tanks required?
    I'm not sure what code cycle, but to me as a HI it doesn't really matter if it is a closed system. Just remember, it doesn't have to be a "tank" there are other expansion "devices" and they don't have to be near the water heater.

    The beatings will continue until morale has improved. mgt.

  6. #6
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
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    Cool Re: Water Heaters and Expansion Tanks

    The EPA has been requiring backflow prevention for years but it is rarely enforced. A backflow preventer requires an expansion tank.

    In areas with high water pressure, a pressure regulator must be installed with the backflow preventer so it, too would require a tank.

    If you live in defiance of the EPA regs. and have less than 85psi water supply, then a tank is not required. As for the plumbing code requiring BF prevention, it is confusing enough that most AHJs don't require it except at specific hazards such as boiler feeds, fire sprinklers and lawn irrigation systems. See IRC P2902 for crystal clear details...

    Keep the fire in the fireplace.

  7. #7
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    Default Re: Water Heaters and Expansion Tanks

    The expansion tank is not required.

    Control of thermal expansion pressure is what is required.

    Control of thermal expansion can be done with the installation of a pressure relief valve ... as much as I dislike pressure relief valves and their installation - they are allowed.

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

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