Forum Title: New Pipe Hammer after installing an Expansion Tank
Hello gentleman, and if your not a gentleman I would still appreciate your weighing in on this... it doesn't make a bit of sense to me. I just installed a third water heater in our house after a couple water heater failures in fairly rapid succession. The plumber that installed our first new water heater when we bought the house, did not incorporate an expansion tank into the installation. I decided I shoud to install the newest water Htr exactly like recommended in the installation instructions, and per code requirements with a new 5 Gal expansion tank. Or house has copper water distribution lines. We've lived in our house 5 Yrs, and proir to the installation of this new expansion tank we had never heard any pipe hammer. I installed the expansion tank in the 1" main line within 5 Ft of the new water Htr. Suddenly when turning on the tub hot water proportioning valve in the closest bathroom, there's a new pipe hammer. Any ideas???
Category: Plumber Post By: EDWIN SALAZAR (Stockton, CA), 06/10/2016

If the valve at the tub is a pressure balance valve the valve has to sense hot & cold water pressure to operate. If you have replaced 3 water heaters in 5 years you have a problem that needs to be address. Something is causing the premature failure and it's being over looked.

- ANDREW KING (St. George, UT), 09/03/2017

Did you open the farthest fixture when refilling the lines with water to blow the air out the system ?

- HILDA GRIFFITH (Lincoln, CA), 09/13/2017

Quote: Originally Posted by IFIXH20 Did you open the farthest fixture when refilling the lines with water to blow the air out the system ? Thx for the reply, I Did... Opened all the hot and cold water fixtures, once the main was back on and the water heater filled I started shutting off faucets... Thats a water waster! The proportioning valve on that tub wasn't working at all (wouldn't even run cold water through it) when I had the hot water lines shut down to install the water Htr... I'm by no means an expert about how proportioning valves are supposed to work, but wondering if it could have something to do with that old faucet proportioning valve???

- MARION PENA (Antioch, CA), 09/23/2017

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