If you don't have a check valve or other backflow preventor between the meter and the water heater, an expansion tank won't help you. It won't hurt either.
Respectfully, a working pressure regulator (PR) is a backflow preventor until the downstream pressure gets higher than the city pressure. At that point, the PR bypass valve opens making the system an open system. So yes, with a working PR, an expansion tank will help in keeping the downstream pressure within about 5 lbs higher than the PR setting.
The Following User Says Thank You to Homerepairguy For This Useful Post:
My shower has never had really hard water pressure, but when I took one earlier the pressure was so hard that it could peel the meat off your back! The hot water didn't last at all...took maybe, maybe, maybe 2 minutes for it to run out. The water pressure in the rest of the house is fine. What could this be? My cousin says it sounds like the Pressure Regulator has went bad and that the shower is on a different one than the other things in the house. Could this be the problem? And how hard is it to fix? I have put a call into my landlord several times, but he's a slumlord and doesn't really care about anything. We can't even take a bath...even when running a tub bath I can get about 4 inches of water and the hot water is gone. I checked around the hot water heater and there are no leaks. What is this problem?
_____________________________________ plumber stockton
Recommend starting a new thread for your topic as it sounds like a different problem. You may get more responses in a new thread.