It is an older (80’s) adjustable valve that uses the hot water supply to fill the tank. I looked at it and it’s corroded, and the cold/hot mix valve on the top broke when I tried to turn it. The concept of using hot water to fill the tank is not really feasible, because the hot water in the line is cold and take a few gallons of running just to get hot, so it doesn’t really prevent the tank from sweating in the warmer weather.
Should I just use the cold water supply line to supply the tank?
I’m rather afraid to turn the water to the house off and mess with the hot water line. Is it tied into the hot water baseboard heating system? I don’t want to get air in the system since I don’t know how to purge the air from the lines… or is it OK as it is separate from the HWBB system?
No, I haven’t checked the toilet water supply valve yet for proper flow. Do these things go bad or need repacked?