I have a 2-year old house. In order to install several new hose bibbs, I recently shut off the main water supply at the gate valve where the pipe enters the house. After restoring the water supply, I noticed water hammer at every faucet, dishwasher, and washing machine in the house. I never had a problem with water hammer before.
I measured water pressure to the house at 55 psi. There is a Zurn (Wilkins) thermal expansion tank Model WXTP-8 (2.1 gallon) above my water heater, and the pressure at the air valve on the tank measures 55 psi. There is no separate water hammer arrestors anywhere in the system.
How can I restore the quiet operation that I had before replacing the hose bibbs? Is there a certain way to drain the system that will solve the problem? Do I need to discharge and recharge the expansion tank? Or what??
Thanx, Key Bored