I valved off everything the other night except the hot water line from the water heater. Sprinkler valves ice make everything. Toilets quiet. I measured the meter at the beginning and it was 55508 and seven hours later it was 55516. The lowest two digits are red and the other three are black. I called the water company to ask how to read it. It says units are ft^3. So in seven hours that's 8 ft^3 or about 60 gallons. I am so confused by this because I would imagine water running out the front door at that rate. I'm certain it is on the hot side or perhaps this could happen. I have single handle faucets throughout. One in the bath where I hear all the sounds leaks across between the hot and cold sides. I suppose it is possible for hot water to find a parallel path through that faucet and join cold water going out a cold water leak. I doubt it though because I had the copper sulfate coming out the tub on the hot side. There is no more of that coming out anywhere though. Sometimes the pipes are totally silent. Dead silent. Other times I can hear it in the air else need stethoscope touching the pipes. Perhaps stuff plugs the hole. I wonder if I could find it with a FLIR camera? Do those work? I doubt it could detect it through the slab and carpet if that is where it is. I'm willing to spend the detection cost toward equipment because I think this old house will have more of these. I'd have a plumbing make the patch but if I could locate and expose it that would save a lot. Oh I installed a 3/4 1/4 turn valve at the outlet of the water heater and shut it off when we don't need hot water. I do hear water rushing though the valve as I open it with the stethoscope.
Last edited by davidinnm; 09-25-2013 at 01:31 AM.