Quote:
Originally Posted by LabRat
I think it has to do with water pressure and possibly coupled with a loose fitting. The main clue is that the problem goes away when you use water which reduces the pressure. The regulator you are using maybe allowing the pressure in the lines to slowly creep up when there is now water usage. It is had to tell without a pressure gauge.
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I had leaking under sink with adjustable water regulator and found the leak by letting the hot water heater pressure build up and that started the leak. If air gap in hot water heater was sufficient, no leak, but if not it would leak when pressure built up from the hot water. I fixed it by better securing the fitting, just tightened them.