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Thread: Banging heater but drain is clear

  1. #1

    Default Banging heater but drain is clear

    Hi All,

    I've searched through the forums for remedies to a banging gas hot water system. It only seems to happen when the gas is on so i think it is sediment.

    The problem is when I drain the tank, the water comes out clear and there is no sediment visible. When I refill and run the hot water taps in the house it comes out brown for a little while but I'm guessing that is just crap in the pipes?

    I thought it might be a loose flue expanding with the heat but the noise happens when i turn on the hot water taps as well so I don't think that is the reason. Could that rule out sediment as well?

    Thanks
    Jac

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default banging

    The noise is caused by "nodules" which have built up on the center flue. Water in the nodule is "super heated" and when pressure drops when you open a faucet, or sometimes just when the water is heating, that water turns to steam and then causes a "mini explosion" when it condenses back to water. Those mini explosions are what you hear as banging.

  3. #3

    Default

    Quote Originally Posted by hj
    The noise is caused by "nodules" which have built up on the center flue. Water in the nodule is "super heated" and when pressure drops when you open a faucet, or sometimes just when the water is heating, that water turns to steam and then causes a "mini explosion" when it condenses back to water. Those mini explosions are what you hear as banging.
    Ok thanks for that. What can I do to clear them out?

    Thanks
    Jac

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Default noise

    Replace the heater. They are similar to rust pockets bonded to the metal and nothing will remove them. Eventually, the metal will be eaten through at one of the nodes and cause the heater to leak. But it could take years for it to happen.

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