Hi. I just moved into an older house that has two water heaters (one
connected to upstairs plumbing and the other connected to downstairs
plumbing). The water heaters appear to be less than 10 years old, one
possibly 5 years old. After moving in, I noticed that both
top-mounted water heater pressure relief valves had a slow drip that
came from the outlet part of the valve (not from the threads below).
The drip rate is significant enough to make a rag sopping wet within a
day, and also to form a damp circle around the bottom of the water
heaters on the concrete. I figured that the valves may both be bad or
have accumulated some crud that slightly kept the valves open, so I
purchased two completely new relief valves and installed them. I also
turned the temperatures down to about 110-115 degrees.
The same problem continued! New valves and they both still had a slow
drip from the valve outlet. Does anyone out there have any good ideas
on what may be causing this unusual situation?
Thank you for any flashes of brilliance or helpful suggestions!