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My Brother in law has a 7 year old Boilermate, that is leaking at the top. It is a CH-41Z. All 4 pipes enter or exit from the top. It is leaking on the domestic hot water outlet, at the threaded brass piece (adapter) that comes through the top flange, It just started, a very small, but persistent leak. The brass adapter has a big nut that i would assume tightens the adapter to the top flange of the heater. It is 1 11/16" sized, but after cutting the outlet pipe and spinning the T&P assembly out, and putting a socket on it, it could not be tightened or loosened. Possibly assembled at the factory. Any suggestions on what else could be done? Seems too early to replace the unit.