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  1. #1
    Senior Member kevmk81's Avatar
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    hot water heater question - since we're all plumbers here ;-)

    So, I'm sure this is a general enough question for those that know:

    Last night I heard knocking coming from my hot water heater. I took the day off of work today to fix the darned thing, and I hope I spent my day off wisely by flushing out the hot water heater correctly.

    I turned off the gas to the hot water heater. Attached a garden house to the spout on the bottom of the unit. Turned off the cold water supply. This is where my question comes in at... I read that you need to open the pressure relief valve at the top of the water heater, but when I did, hot water just pours out. I filled bucket after bucket of hot water (which was dirty, rusty, and had white stuff at first), till I decided to just close the valve, and open the valve where the hose is attached to let the bottom drain out. I let it drain till the water was clear.

    I hope I didn't just waste a PTO day by not doing the right thing

    I guess I'll find out later if it's still knocking...

  2. #2
    You gonna eat that? Doohickie's Avatar
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    Try your question here. I've gotten good results from them.
    I stop for people / whose right of way I honor / but not for no one.



    Originally Posted by bragi "However, it's never a good idea to overgeneralize."

  3. #3
    Senior Member
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    My newish(?) water heater knocks. I have never heard a water heather not knock. What does the knocking mean?!

  4. #4
    Senior Member jdon's Avatar
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    Did you open the little door on the side to see who was there?

    Here.. http://home.howstuffworks.com/water-heater1.htm

  5. #5
    Senior Member jdon's Avatar
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    Quote Originally Posted by SonataInFSharp View Post
    My newish(?) water heater knocks. I have never heard a water heather not knock. What does the knocking mean?!
    Thermal/pressure relief valve will occaisionally bump. Air anywhere in your house supply will cause knocking. When does it knock and is it more of a crackle (tank being heated causing expanding and contracting)?

    Oh, if you have corrosion, you may need to replace the anode.

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