Re: w.h. t+p valve
Are we talking about a residential water heater for domestic hot water, or a heating boiler with a small expansion tank?
If you look at any tank style hot water heater for residential use that was made in the USA for use here in the USA you'll see that it has a special port that is just for the T & P relief valve and nothing else. You are to screw the T & P valve directly into this port which is normally on the side and close to the top, but is sometimes on the top of the tank. The next time any of you are in a plumbing supply house or a home center, take a good look at the different tank style water heaters.
As for needing an expansion tank, that would be if there is either a pressure regulator for the feed water (most likely the whole house) or a check valve or both. In addition to the T & P valve (on water heater) there should be a pressure relief valve just after any check valves or pressure regulators.
Please see picture for example, and please be sure to properly pipe the discharge so it's a few inches above the floor and aimed at the floor. This is for safety reasons.
Last edited by Woussko; 01-28-2007 at 02:54 AM.
Tags for this Thread