Water Pressure and Expansion Tanks

I found a solution to a problem I have been having at the house for years.   My water pressure is regulated by a pressure regulator,  so water coming in from the street at 130psi is brought down to 60psi before it enters my house.   All of our houses should have one of these.     However whenever I used hot water,  I would notice in the minutes that followed that my water pressure would skyrocket and water would spit out of my faucets very quickly for a few seconds,  and then the pressure would be back to normal.     It turns out that our pressure regulators are also acting as check valves,  not letting pressure from inside our house back into the water supply.      What came recommended was an expansion tank.    These are simple devices that absorb expansion from the activity of your water heater.    NOTE: this problem may not apply to tankless water heaters.


I’ve put together a video showing a demonstration of the problem I was having,  and how the solution worked for me.   Of course your mileage may vary.   One thing is certain though:   All of us must check our water pressure yearly, and if you suspect you are having any variances in water pressure,  seek the advice of a plumber.     If you don’t have access to a pressure tester,  they can be bought for $12 over at Ace Hardware in San Dimas.    Otherwise,  you can drop me a line and I can swing by on one of my weekend walks around the community and you can test your pressure.     I can’t stress the importance of this enough.   We’ve had several members of our community suffer plumbing failures that have been very costly in time,  money, and personal property. The pressure from our water supply is about 130psi. Our houses should not have more than 80psi in the pipes.

Here is a video I posted on Youtube showing my diagnosis of the problem, and the installation of my expansion tank.


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