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Knocking sound – Water Heater – HELP!

Home Forums Archives Old Bulletin Board Archives Knocking sound – Water Heater – HELP!

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    • #284707
      Avatar photoRusty Rouse

        When our water heater is heating water after water use, there is a knocking sound. Is this a problem and if so, how can I fix it? DO I need to replace the heater?

      • #308542
        Avatar photoMike H.

          Boiling, knocking sounds from the water heater usually mean it has a lot of lime build up inside. Something about the water boiling under the lime or whatever, I really dont know…But I see it a lot here (the water is hard). You can try to clean it out, or replace the heater, or live with it. I never saw a heater get damaged by the knocking.

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