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    rockybull's Avatar
    rockybull Posts: 6, Reputation: 1
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    #1

    Jul 24, 2009, 11:50 AM
    Noisy water heater
    Hi all:

    I have an electric water heater that makes a sound like someone is trying to get out (with a hammer) when I turn on my dishwasher and only then. Does anyone know what this might be?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Jul 24, 2009, 12:03 PM
    Quote Originally Posted by rockybull View Post
    Hi all:

    I have an electric water heater that makes a sound like someone is trying to get out (with a hammer) when I turn on my dishwasher and only then. Does anyone know what this might be?
    Your DW's on the same branch as your kitchen faucet. Any noise when you use the faucet? Tell me more about this "hammer sound". Is it just one big bang , a series of bangs that won't stop or a bang every once in a while when the DW's cycling and filling? I want ALL the details you have. Is your home a older one? Let me know, Tom
    rockybull's Avatar
    rockybull Posts: 6, Reputation: 1
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    #3

    Jul 25, 2009, 10:08 AM
    When the DW is filling the water heater makes a the banging sound and it started slow and not all the time . It started only at night but does it all the time now. I live in California so I have an air gap and disposal. The thing it, it only happens when when I turn on the DW and it is so loud it goes through the whole house, which is not that big.


    Thanks Roxanne
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #4

    Jul 25, 2009, 10:21 AM
    This noise does, indeed, come from the water heater. Right? Do you have heat trap nipples ,(see image) installed on the inlets of the heater? Let me know. Tom
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #5

    Jul 25, 2009, 12:29 PM

    Sounds like a loose washer in the stop valve under the sink where the DW is connected to the hot water. Try closing stop valve then reopen about half way to see if there is any difference.
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
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    #6

    Jul 25, 2009, 01:00 PM

    Tom,

    Why would the heat trap nipples cause the noise?

    Thanks
    John
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #7

    Jul 26, 2009, 06:10 AM
    Quote Originally Posted by afaroo View Post
    Tom,

    Why would the heat trap nipples cause the noise?

    Thanks
    John
    I have had a prob lem where the balls in the nipple would vibrate and since he said the noise came from the heater and the heat trap nipples have the only moving parts that's what I focused on. However, If you have a better solution I'm all ears. Tom
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
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    #8

    Jul 26, 2009, 06:18 AM
    Quote Originally Posted by speedball1 View Post
    I have had a prob lem where the balls in the nipple would vibrate and since he said the noise came from the heater and the heat trap nipples have the only moving parts that's what I focused on. However, If you have a better solution I'm all ears. tom
    Tom,

    That's good to know experience talks, no I don't have other solution, Thanks for the info.

    Regards,
    John
    rockybull's Avatar
    rockybull Posts: 6, Reputation: 1
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    #9

    Aug 7, 2009, 02:46 PM

    No we do not have those nipples. I think the noise is in the hot water pipe next to the water heater and for some reason only whenit's cold so nothing to be done. Thank you so much for all of the advise
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