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    346's Avatar
    346 Posts: 1, Reputation: 1
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    #1

    May 12, 2014, 07:31 AM
    Knocking hot water pipes. How do I fix them?
    I installed a gas on demand tankless water heater 3 years ago. The knocking hot water pipes has increased over the 3 years to the point I think they are going to break. What can I do to release the pressure? How do I secure the pipes? (I thought I did but it always finds a new spot) Do I replace my old pipes with bigger ones to go with the new water heater? Built in 1981. Thank you
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    May 12, 2014, 08:16 AM
    What size supply and feed pipes do you have. Do you have an expansion tank? Does the vibration happen on all fixtures ot just when you use certain ones?
    dcplumber's Avatar
    dcplumber Posts: 20, Reputation: 3
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    #3

    May 13, 2014, 07:58 PM
    Something must trigger the hammering or knocking pipes or are they loose and need to be secured? Are both hot & cold are making the ruckus? Need more info.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    May 14, 2014, 07:38 AM
    Do you have water hammer when you shut off a hot water faucet? Or do the pipes vibrate for a while after you shut the water off? Back to you, Tom
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