I fixed a Water Knock that started about 2 years after we moved into
OUR new home (the house itself was not new.)
Now we get a knock when turning off the HOT water.
Do I fix it the same way - cut off the water, open the lowest drain (
the water hose faucet) then open several fixtures in the house
draining the water in the knock arrester.
I believe that is right - it fixed the knock in the cold water any
But, is it the same for the hot water knock? Or do I need to do
something with the water heater to open it to atmospheric pressure?
Any help would be appreciated so I don't screw up the new water heater
I managed to install without any cussing or screw ups.
If I have to drain the heater, I'll just drain it below the level of
the Emergency Relief valve. Then open said valve to atmosphere. That
SHOULD work, IF messing with the HWH is the right thing to do.
Maybe it is a good thing I didn't read about how to drain the heater.
I just put a hose on the drain, ran it through a filter to my pressure
and used the hot water to clean the walk. Then let the rest of the
water run into the lawn. Opened the emergency valve on the tank to
help it drain and all the hot water fixtures in the house. No
I was planning on just opening the emergency valve and draining it to
that point, but then I realized that the hot water enter a pipe on the
bottom of the tank, not the top ( or hell I could be completely
wrong), so as I said, I drained the entire tank.
The hardest part was turning off the water to our home.
Congratulations on the repair. You're on your way to full-time
employment as a handyman!
I'm glad the draining went well. It usually does, but some people have
trouble getting the valve to close again because of lime buildup. It's
even worse when the valve is plastic.
Yes, the cold water is introduced at the bottom of the tank by a "dip
tube". Please check your emergency valve too. You should check it every
year. Beware that it, also, can build up lime and not shut off, so be
prepared for a trip to the hardware store.
Ok, I admit I am a poor DIY, but when you say
"it" do you drain the pipes or drain the hot water heater?
IF you are speaking of the HWH, can't I just drain it below the
emergency relief value and just open that to give the tank
Standard Atmospheric pressure? Well, comment on it please,
but if I have to mess with the tank, that is what I'm going to do.
Hell, I guess I should have just tried what I did with the cold water
first. Then mess with the tank if that doesn't work.
On Tue, 27 Nov 2007 14:24:44 -0800 (PST), Travelover
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