[qcj]

As many turns that has to be done to cut these valves off they must be gate valves and I have not seen a gate valve yet that after a few years that wouldn't leak when you cut it off. I have rent property and changing out a hot water heater that has a gate valve when you cut off it still leaks a little. I use ball ball valves now that 1/4 turn cuts them off. So if these valves are gate valves when you cut them off they can still leak at the stem. I don't know weather of not a ball valve could take the heat. A hot water heater it is for the cold water supply and here it is over 200. These valves are 15 + years old and my best guess is to replace them. Need to find out who makes them or how to repair them.