When installing a Water Pressure Regulator, how important is it to also install a Water Expansion Tank?
Thanks so much,
Steve
IF the PRV has a bypass, the house pressure has to exceed the supply pressure to open it. Depending on where you live, that may still cause other problems. And, code requires one when you have a check valve. Basically, many towns are now trying to make their supply safer...letting your house push water back into their system can pollute the water for everyone downstream from your supply. So, many are installing check valves at the meter (and might not tell you), creating a problem for the homeowner with the T&P valve releasing to relieve the pressure.
Hmm I wouldn't say it's necessary but it's a good idea. If you're going to put one in install it on the hot side of your hot water tank. This is the best spot for it.
.
You are a plumber? A Licensed plumber? One with some experience under his belt?
I pray you are not a plumber in the state of Illinois. Here is the part in the Illinois plumbing code about how and where to install the expansion tank.
A properly sized and approved expansion tank shall be located on the outlet side of the check valve, PRV or backflow preventer, in the water heater's cold water supply with no shut-off valve between the heater and expansion tank.
Up here in BC we aren't required to put them in. So the only mistake I made was you guys are forced to put them in on the cold water inlet of your tanks. We put them on the hot water outlet. Same effect.
Also if you read that code clause it doesn't say you have to put the expansion tank at the PRV etc. It just says you have to one one the outlet side between it and the tank with no shut off valves in between. You could put it on the inlet of the HWT it self with a couple of brass fittings.
The manufacturers here say to put it in on the cold side. Failure to do that often risks premature failure.We do the same thing but on the outlet of the HWT.
This is awkward, but...
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