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    javadk's Avatar
    javadk Posts: 2, Reputation: 1
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    #1

    Oct 13, 2009, 09:25 AM
    Banging noise in hot water pipes - water running or not
    What could cause banging noise in hot water pipe lines whether the water is running or not?

    The noise happens when the hot water is turned ON wherever in a two level house.
    The banging noise also happens when NO faucet is running.

    We have installed an expansion tank above the gas water heater to no avail.
    I lowered the hot water temperature on the water heater to no avail.
    The banging noise, mostly along the hot water copper pipe line in the basement ceiling, coincided with a replacement of a valve on the cold water line, and change in gas pipes but we cannot tell if there is any link and how.
    Anyone has any idea why?
    Thanks-
    J.
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #2

    Oct 13, 2009, 01:43 PM

    When is the last time you flushed the water heater? How old is the water heater? What type of heating system do you have?
    javadk's Avatar
    javadk Posts: 2, Reputation: 1
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    #3

    Oct 14, 2009, 10:57 AM

    Last flush? I don't know
    We have gas water heater and it is 3 year old max.
    I have read about deposits in the heater but I doubt this is the issue since the banging noise started almost exactly after the work on cold water valve and putting larger gas pipe. The gas was cut for a day or two for the contractor to do the work and we used the hot water both days. Would you say this is system wide pressure change?
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