Hot water lines hammering

Discussion in 'Water Heater Forum, Tanks' started by Bob Labonte, Feb 3, 2021.

  1. Bob Labonte

    Bob Labonte New Member

    Joined:
    Feb 3, 2021
    Location:
    New Hampshire
    My hot water lines are banging when faucets are shut off. It doesn't happen with the cold water. It seems to be at or around the hot water tank. I have a system 2000 with a 40 gal tank that came with the system. Ive drained the tank. Not sure if the expansion tank has anything to do with it. I took it out and it still bangs.
     
  2. phog

    phog Active Member

    Joined:
    Jul 29, 2017
    Location:
    Rochester NY
    Replace the expansion tank with a new one. They do go bad.
     
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  4. Bob Labonte

    Bob Labonte New Member

    Joined:
    Feb 3, 2021
    Location:
    New Hampshire
    I did that and it is still banging
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Is this a new symptom, or has it always done this? Has any plumbing work been done recently? ANy other remodeling?
     
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Do you get a single bang when you close a hot water faucets, whether you close fast or slow?

    Heat traps on the water heater can make noises.
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I was thinking heat traps on the water heater too.
    Maybe change those out to see, not trapped of course.
     
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