That’s right, you’re absolutely correct!:oops: :oops:
I have seen at least one pressure relief valves leaking after the water heater turned on, most likely due to a no-backflow type pressure reducing valve.
If there is no pressure reducing valve at the home you can get the pressure reading at the hose bibb. If there is a pressure reducing valve check to see if the hose bibbs come off of the line prior to the valve.
I find exterior hose bibs with higher water pressures almost all the time…
…if there is a landscape irrigation system present, and when I did landscaping in Texas, we also used a higher pressure for the irrigation system.
For the house, 40-80 psi, although I personally prefer 40.
Several years ago I found 176 psi in a home that was only a couple of years old. The seller had already disclosed that he had been having a lot of plumbing problems but that his plumber couldn’t determine what was wrong. Hmmmmmmmm. Maybe need a new plumber? I explained to my Clients what was wrong, and they bought the house. They are also currently good friends of mine, and in four years of owning the house, have had no problems after having my plumber install a new pressure regulator and lower the pressure to 40 psi.
wow.
That is correct - so it really doesn’t matter where you measure to determine what pressure all devices in the home must be able to withstand. “In use” pressure will indeed be different downstream of a pressure reducing valve.