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  1. #1
    Join Date
    Jul 2008
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    Chicago
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    261

    Default Water Heater Knocking When Toilet Flushed

    A one bathroom ranch on a slab. This knocking sounds like it is coming from the water heater and only happens when I flush the toilet, not when I run other fixtures.

    ???


    https://www.youtube.com/v/WPntL4XrPBI

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    Mike Lamb
    Inspection Connection, Inc.
    http://www.inspection2020.com/

  2. #2
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    Default Re: Water Heater Knocking When Toilet Flushed

    Its likely a bad valve on the fill mechanism of the toilet. The diaphragm could be resonating due to water pressure, thus the noise.

    Did you try closing down the shut off valve to see if it affected the noise.


  3. #3
    Darrel Hood's Avatar
    Darrel Hood Guest

    Default Re: Water Heater Knocking When Toilet Flushed

    This description also raises the possibility that the toilet is using hot water. If so, there is an opportunity to save a little money.


  4. #4
    Join Date
    Feb 2008
    Location
    New York
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    869

    Default Re: Water Heater Knocking When Toilet Flushed

    Quote Originally Posted by Mike Lamb View Post
    A one bathroom ranch on a slab. This knocking sounds like it is coming from the water heater and only happens when I flush the toilet, not when I run other fixtures.

    ???


    https://www.youtube.com/v/WPntL4XrPBI
    Change your diet.

    Steven Turetsky, UID #16000002314
    homeinspectionsnewyork.com
    eifsinspectionsnewyork.com

  5. #5
    Join Date
    Jul 2008
    Location
    Chicago
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    Default Re: Water Heater Knocking When Toilet Flushed

    A hot water feed to the toilet makes sense. I never felt the tank to see.

    Mike Lamb
    Inspection Connection, Inc.
    http://www.inspection2020.com/

  6. #6
    Join Date
    Jan 2009
    Location
    San Antonio, TX
    Posts
    24

    Default Re: Water Heater Knocking When Toilet Flushed

    Quote Originally Posted by Mike Lamb View Post
    A hot water feed to the toilet makes sense. I never felt the tank to see.
    I've come across this noise when the water shut off valve is not opened competely. Also some homes don't have water hammer chambers.


  7. #7
    Join Date
    Jul 2008
    Location
    Chicago
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    261

    Default Re: Water Heater Knocking When Toilet Flushed

    A gentleman at The Inspectors Journal suggested that it is likely the ball in the WH heat trap knocking around when there is a slow water feed from the WH tank to the toilet.
    heat trap nipple.jpg

    Mike Lamb
    Inspection Connection, Inc.
    http://www.inspection2020.com/

  8. #8
    Join Date
    Jan 2009
    Location
    San Antonio, TX
    Posts
    24

    Default Re: Water Heater Knocking When Toilet Flushed

    Down here in the south we plumb the toilet with the cold water supply. Is there a reason to run a hot water pipe to a toilet?


  9. #9
    Join Date
    Jul 2008
    Location
    Chicago
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    261

    Default Re: Water Heater Knocking When Toilet Flushed

    Quote Originally Posted by Ray Babcock View Post
    Down here in the south we plumb the toilet with the cold water supply. Is there a reason to run a hot water pipe to a toilet?
    It's not common but it can stop toilet sweat and I have been tempted to do it to a bathroom at a summer home I have in Michigan. The condensation can be a real mess.

    Mike Lamb
    Inspection Connection, Inc.
    http://www.inspection2020.com/

  10. #10
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Water Heater Knocking When Toilet Flushed

    It would be easier to switch the toilet out for a new one with a lined tank. Why pay to heat water to stop sweating?


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