Water Meter

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by molo, Jul 10, 2007.

  1. molo

    molo Member

    Sep 23, 2006
    Cold New York
    Hello All,
    I have a question about water meters. How can you tell if the water meter has a backflow preventer or checkvalve? I'm trying to get a better understanding of the pressure/expansion subject. I have no expansion tank or pressure regulator with a gas hot water tank.

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    From what I understand, they are fairly common on new installations today, but weren't awhile ago. If there is a part number on the meter, or maybe it will say, that would tell you. You could also call the local water company.

    If there is one, and it could be external to the meter, then you should have an expansion tank. It would be fairly obvious if you ran a little test. Buy a gauge, with the WH off (i.e., not running - the water hot), check the pressure with no valves open. Then, take a shower, bath, or wash dishes, or clothes with hot water - the more used, the better for the test. Close all of the valves so no water is being used and watch the gauge as the water is reheated. If the pressure rises, your system is closed. If it doesn't, it isn't or you have an expansion tank or some other complient hose or something that is expanding to allow for that increased volume.
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