Posted by Joe I on December 29, 1997 at 16:02:36:
In Reply to: Re: Re: Re: Re: Leaky hot water tank posted by Richard H on December 29, 1997 at 07:41:17:
: It's my understanding that you use expansion tanks for CLOSED systems only - like well systems. PRV are fine for street water. Hill
: I live in Mountlake Terrace, Washington, and the city made me put on an expansion tank when I replaced my water heater. Our water does not come from a well, but from the mountains.
I live on Long Island, NY and all the local water districts require backflow prevention devices on all water services entering houses. In some cases, I have seen relief valves on direct fired hot water heaters drip due to thermal expansion. This condition does not happen in all installations but when it does it is corrected by installing a pressure trol.