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    jffnszn's Avatar
    jffnszn Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 20, 2013, 10:00 AM
    Water Hammer at Hot Water Heater
    We've traced our water hammer to the hot water side. Closing the water supply to the water heater eliminates the hammer. The hammer is triggered by shutting any valve throughout the house as well by flushing any toilet; but the sound is loudest right at the water heater.

    Our water heater is equipped with an expansion tank, and the pressure gauge downstream of the pressure regulator indicates 70psi, so we're figuring the fix is the installation of an arrester. Should the arrester be installed on the hot water pipe that exits the top of the water heater? If not, where?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #2

    Nov 20, 2013, 11:59 AM
    Hi Jffnszn

    More likely will be that the water heater has DIELECTRIC nipples with heat trap balls in them. Remove the nipples and replace with new dielectric nipples without the heat trap balls in them... ;)

    Mark
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