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Help-Water Level Increases on its own!
The water level of my system increases on its own...The system is manual feed...The valve is not leaking...I have shut down the house water main and the level increases anyway...I have flushed the low water many times while the boiler is at pressure and also while it is at zero pressure...The water is fairly clean. The system works great otherwise...No noise or water hammer at all...Nice balanced heat from the radiators...Any Ideas? I'm stumped.