Water Hammer - Hot Water all faucets

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by ryan87500, Jan 1, 2021.

  1. ryan87500

    ryan87500 New Member

    Joined:
    Sep 8, 2008
    Location:
    New York
    I have been in my current house for about 4 years and this issue just started. It seems when I turn off the hot water in just about every faucet I get a real bad water hammer noise. I checked the PSI at one of the sinks and they are at 60-65.

    I did try turning the water off and draining the entire system which seemed to help for a day but then back to hammer time.

    I wasn't sure where to even start since I can't pin point one sink and it seems to be just on the hot water side.
     
  2. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Buy a shock absorber and place it by the heater.

    Also, make sure all the piping is secured properly or make your own air chamber
     
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  4. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Try leaving all faucets on for at least two hours with the water shut off.
     
  5. Sarg

    Sarg Enjoy Learning

    Joined:
    Nov 6, 2020
    Occupation:
    Recently retired
    Location:
    NorthEast
    "Try leaving all faucets on for at least two hours with the water shut off."
    What will this do ?
     
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    When you turn off the faucet slowly at the end, does the bang happen then?

    I understand that you cannot control the start and stopping of water for the dishwasher or clothes washer.

    It will let the old-time shock arresters empty better.
     
    Sylvan likes this.
  7. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Semi-Retired
    Location:
    NW Ontario, Canada
    If you completely drain the system, some of the air might recharge the old-style open hammer stops but only if the stops drain.
     
  8. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    IT WILL WASTE Gallons of water and accomplish NOTHING
     
    Jeff H Young likes this.
  9. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Water is shut off. So probably under 3 gallons wasted, unless the WH siphons. Closing the WH supply valve would prevent that if the dip tube does not have the intentional little hole to prevent siphoning.
     
    Last edited: Jan 1, 2021
  10. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Semi-Retired
    Location:
    NW Ontario, Canada
    The water is not wasted, just recycled.
     
    Sylvan likes this.
  11. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Sylvan likes this.
  12. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    My home has 5 bathrooms serviced by an 11/2" main 11 rooms over 10 so how can you guess sight unseen how it is only 3 gallons or less??
     
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