Forum Title: Initial high water pressure
Hello everyone. Recently I've noticed that when I turn on the water in my house hot or cold the pressure is initially high for about five seconds or so then drops back down to normal. I bought a pressure gauge and screwed it onto the hot water side of the washing machine hose bib. My house pressure is about 50 psi and about 45 psi when using water. After I use hot water the pressure gauge slowly rises to 80 psi. If I open the hot or cold water pressure drops back down to normal and remains steady. If I turn the hot water tank off and use hot water afterwards the pressure remains at 50. I've searched many forums and the consensus seems to be to install an expansion tank. My issue with this is I have never had this problem before it just started happening. About six years ago I had a new hot water tank and PRV valve installed in the house and no issues until now. Any help would be appreciated before I start making changes.
Category: Plumber Post By: MARY SMITH (Pittsfield, MA), 10/13/2016

it is not a expansion tank. that seems to be the fad here lately it is your PRV. was your prv installed so you can observe the pressure on both sides of it ? incoming will be high and out will be the low replace the prv,,,this time, buy a WATTS prv and you wont have to change it again in 8 years

- BOBBIE RODGERS (Terre Haute, IN), 09/04/2017

Quote: If I turn the hot water tank off and use hot water afterwards the pressure remains at 50. I've searched many forums and the consensus seems to be to install an expansion tank. My issue with this is I have never had this problem before it just started happening. You need the expansion tank IMO . The PRV may or may not have a check valve or the city may have installed a new meter w/ check valve preventing the thermal expansion event from returning to municipals water.

- JOANN MAY (Winston Salem, NC), 09/18/2017

There is no where to connect before the PRV to check the pressure. I do not have the issue with the hot water tank turned off so how can that be the PRV when it's happening due to thermal expansion? Does the PRV allow pressure above it's setpoint to push back out to city water?

- IRENE WATSON (Carrollton, TX), 10/09/2017

Homeowner Support & Resource Links

requestaquote Get Free Quotes callnow 888-880-2779