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Old 02-19-2018, 11:21 AM   #1
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water hammer?


I've been in my house for 7 years and it was only a few months ago that I started hearing a "water hammer". House was built in 72, not sure what our water pressure is but it's pretty high. It happens at completely random times, sometimes in the middle of the night when everyone is sleeping. Sometimes it'll last just a few seconds and occasionally I swear it lasts minutes.

What could cause this to suddenly start happening? I've noticed that when it's happening, it triggers the relief valve on my hot water heater and it'll release a small stream of water the entire "event".
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Old 02-20-2018, 09:55 AM   #2
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Re: water hammer?


#1, City or well water?
#2. Is there a pressure reducing valve?
#3, Check the water pressure.
https://www.homedepot.com/p/Rain-Bir...-P2A/100575619
#4, Check the toilets for a leaking flapper, just add some red food coloring to the tank and see if it ends up in the bowl overnight.
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Old 02-20-2018, 12:59 PM   #3
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Re: water hammer?


Please answer Joe's questions so we may better help you.

First, find out ur incoming water pressure. Check at any hose bib like garden or washer.

Is there an expansion tank on the water heater?

If there is a pressure reducing valve it may need servicing, adjusting or replacement. If ur water pressure is over 80 psi, and you don't have one, I would recommend installing one. Just a suggestion.

Normal water pressure is around 55-65 psi., and that's what ur expansion tank on ur water heater should be set to as well.
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