Originally Posted by steveincolumbus

check water pressure in house, the valves are made to releave pressure at 150 lbs. If pressure when leaking is normal its the valve, if high, likely to be a one-way-valve or regulator in line preventing backflow, and then you would need a pressure tank of sorts to have a place to expand to.... sence water expands when heated

http://www.factsfacts.com/MyHomeRepa...sureRelief.htm