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The thermal expansion relief valve is made by Apollo and has a rating of 80psi. Since my pressure is WAY below that I should probably look at either replacing that valve, or buying an expansion tank. Thanks everyone, huge help!

Got the reading. Holding steady at 70psi

Home Depot was actual sold out on all their pressure gauges. I'll see if I can find one today somewhere else. I did consider a DIY gauge from assorted fittings... but, nah

I assume the thermal expansion from the heater will cause the pressure to back up the cold line, but it would peak out at whatever the relief value that's leaking is designed for. Is that accurate enough? Lucky hydraulics are so predictable. Yes, the bib is after the PRV, and I have one in my...

I'll buy the pressure gauge today and get some more information. I'm getting mixed up with the PRV abbreviations. Is that pressure reducing value or pressure relief value? The main city inlet does have a pressure reducing value, although logic would indicate I shouldn't need to mess with it...

It is. It works, I tested it right away when I heard the dripping.

I don't have anywhere easy to screw a pressure gauge in (no laundry tub and washer would be a PITA to get to). What about to the drain for the tank itself?

Correct me if I get my terminology wrong. I believe I have a dripping thermal expansion relief value on my hot water heater. My precious and quite costly BTUs are going down the drain :( The main line has a pressure reducing value. Does it look like I need a thermal expansion tank? Should I...