For the past 40 years I have installed 4- 40 gallon hot water tanks (natural gas) in my home. Today I picked up a new 30 gallon tank, installed it, fired up and could not believe the pressure rise as temp increased, went to 140# and still going at
120 deg temp My incoming pressure is usually 90psi, give or take 10 # I know I am going to need a press reducing valve, either for the entire system, or the hot water tank itself, or an expansion tank for the hot water tank. Question is why in the world am I having pressure rises like this on the new tank, and never had this problem before ? thanks- posted
13 years ago