All,

I own a condo that was built in the mid to late 70's. Recently, we had
individual water meters installed at each unit, and a plumbing company
installed PRV's at each unit as well. Started noticing some strange
things after this happened. First - the water pressure was cut in
half...which is not all that bad, being that our pressure was around 105
pounds prior. Over the past few weeks, I have noticed that our pressure
seems to build. For example, after some time not using the water, I can
flip on the kitchen sink and the pressure is extremely high - then
levels out.

The plumber came out again and replaced the PRV - still notice the
problem!

Anyone have any suggestions as to what might be the problem here? I
would also mention that our hot water heater is quite old (not sure how
old...but during the inspection we were told that it probably had a
couple of years left). Could this be a potential culprit?

Thanks

Chris