On Jul 25, 11:39*am, JayN wrote:
So far I've had the gauge connected for over 12 hours. *I've still yet
seen the red memory needle get above around 98, and it didn't stay
near there long. *The pressure is probably averaging 85 or maybe upper
80s. * It's higher than normal, but not extraordinarily high. *I'm
wondering why they can't install a Watts PRV valve that allows
backflow rather than bothering with an expansion tank? *According to
Watts the ones with a B suffix in the model number allow backflow from
thermal expansion.

You seem to be trying to rationalize your decision not to spend the
extra money to put in a PRV and tank. Whether it's 115 or 100 it's
still high. You seem to think that a leak will occur at an average
pressure reading. That is not how it works. Or maybe you're hoping
that a low reading will convince the leak not to happen at all?

You are asking questions that people in your location are best able to
answer. Our water district has some odd requirements and it is
pointless to argue with them. Why not pick up the phone and call
another plumber? If you don't have one you trust, ask neighbors and
friends for some names.

R