replying to Chris Hill, Bobby wrote:
No hard and fast rules. I have one in this house, never did in my old one.
My water pressure is 70 psi. When the water heats and is not running, pressure
will go up to 100 psi. At that point the PRV will weep a bit. It would leak
about a pint to a quart in a day depending on use. If you have any leak,
put in the expansion tank. If no leak, not to worry,

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