Nards01
New Member
Recently, in one of my rentals, the water line developed a humming or whining sound and a burst of high pressure when the water was first turned on. I replaced the hot water tank last year and upon having this problem now, I added a Watts expansion tank and raised the house pressure to 50 up from 40. This solved the problem for about a day or two but the high pitched sound has returned. The pressure problem is gone. FYI when I installed the exp. tank I pressurized it to 50 to match the line pressure which the instructions said to do. Any suggestions to eliminate this sound would be greatly appreciated.