View Full Version : Expansion Tank

10-23-2008, 07:41 PM
Hi ,
Great forum, this is my first post. My question is whether it is critical for the hot water expansion tank to be installed in the COLD side of the system. My hot water tank installation is in a real confined area, and the previous owners had the expansion tank in the HOT outlet side of the tank. If it must me in the cold side, can I install it anywhere in the cold side of the system? I have lots of room where the line comes out of the slab after the main shut-off valve. Thanks in advance for the help..Great website


Gary Swart
10-23-2008, 11:29 PM
It is my understanding that the expansion tank will work on the hot side, but the cold side is best. It can be installed anywhere between the water heater and the PRV.

10-24-2008, 06:13 AM
Optimum positioning would be with a tee between the inlet valve and the tank on the cold side. The tank may be positioned remote from that location.