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

    Oct 1, 2012, 08:15 AM
    Pressure relief tanks
    Are pressure relief tanks on the cold water inlet line of a gas hot water heater necessary? How do they work?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #2

    Oct 1, 2012, 08:36 AM
    Hi Tony

    Are you asking if EXPANSION tanks are necessary? If you are asking about expansion tanks then the answer is yes, but only if you have a closed water system such as one that has a check valve, a backflow preventer or a pressure reducing valve. Otherwise, expansion tanks are not usually needed on a water heater as thermal expansion is handled by the water expanding back into the water system of the city/town/well, etc.

    You can read more at this link:

    Thermal Expansion - Learn About - Watts

    Scroll down the page for the article on expansion tanks.

    Mark
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