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I thought we were all rgi's on this forum

Above?, what sneaked in?.

Cut it out and fit a proper fill loop kit.

The main hex is inside the combustion chamber,remove the panel on the from it has about 6 screws securing it, look at the insulation panels if there is any damp stains on it or if the main hex has any green staining then the main hex will need changed, as for the non return valve its on the...

The main hex on linea's can leak, check the insulation panels if there's any damp marks on them suspect the ain hex for your pressure loss, as for your hot water problem it sounds like either the plate hex or the non return valve at the plate hex could be choked=-)