: Our home was new in 1993 and in the past 2 years I have been noticing that out water heater is increasingly noisy. It began sounding like mice in the walls and now it sounds like there are rocks in it!!It is very loud and I wonder (1)what it is and (2)if it will do damage. I read a message from someone else and you said it was oxygen bubbles(?)I find it hard to believe that this noise could be caused by anything other than solid material. My neighbor said his does the same thing and that it is a buildup of minerals because we have hard water. Sound possible?
Your neighbor is correct. Have you heard of putting magnets on your water lines to correct this problem?Dale's Plumbing Service LMP