Quote:
Originally Posted by Malsua
Domestic fixtures are nominally rated to 80psi. I.e. this is the pressure they can expect to run without issue.
If you are seeing pressures well above 80, there is something else going on. I have seen pressure hitting around 100 in a home with a failed expansion tank on the water heater.
If the supply side was exceeding even 90psi, toilet valves and sinks everywhere would be failing constantly in that neighborhood.
Certain neighborhoods have a lot of pressure relief valves that start popping off between 75-80. I see these in a lot of homes off BV, north of LSL. These relief valves are in some other areas too, but practically every home up that way has them.
I am a licensed, certified and working home inspector. I get into a lot of homes. I have never found any home with a functional expansion tank where the pressure exceeded 80psi.
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When Nova installs their system they always check the expansion tank if there is a tank hot water system installed but most people never do any maintenance on their until it fails, including the expansion tank. Typiclly they only last 5ish years then need to be replaced and that's if they were installed properly with the correct air pressure.