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Thread: a new noise after installing an expansion tank

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    DIY Junior Member jlp's Avatar
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    Default a new noise after installing an expansion tank

    I had a hot water tank blow it seam somewhere it was leaking or should I say poring water out of the outer jacket. It was covered under warranty. but i chose to install an expansion tank on the cold water inlet of said water heater, now I have a rumbling noise when I run water and the pressure fluctuates. How can I stop the madness?

  2. #2
    Moderator valveman's Avatar
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    Let some air out of the expansion tank.

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    DIY Junior Member jlp's Avatar
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    Quote Originally Posted by valveman View Post
    Let some air out of the expansion tank.
    that did not help

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    Moderator valveman's Avatar
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    OK, then you need to check the air pressure in the tank. Turn the water off to the house and open a faucet to drian house. Then check tank air pressure with a car tire gauge. You need about 30% less air pressure than the lowest water pressure you see in the house.

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