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I'm not touching the oil-fired bit, only the exterior of the primary heat exchanger (boiler bit) but thanks for caring.. : )

Thanks all .........(y)(y)

OK, Ta for that. So Plumbers Mait won't work then :) OK, cupboards coming out tomorrow.

How could I check the pressure without opening a panel?

Obviously know Worcester combi's. It's a tiny leak from the 'flange weld'. Can this be welded with arc - does it need special rods?

Just looked again at R/H bottom entry (currently fitted with drain) with mirror - welding around back of joint to boiler has lime starting halfway up join to boiler so indication is joint failing. Question - can this be re-welded? (if welder can ever get to it)

Mains pressure. Entry at top right blanked off. Any idea if there's any other possible leak points underneath the insulation on the back?

Hi, I have a Worcester Heatslave 26/32 oil fired combi working well for 20 years (apart from odds and sods over the years) Now got water leak on floor under r/h side of main heat exchanger (boiler). Checked every joint - all dry and dusty, every entrance to boiler - 3 at front, 2 at back r/h...

OK, just found an old thread on this subject so answer found ... just got to manage to get in contact with BCO to confirm nothings changed and still ok. Subject dead now .....

I have an internal floor that is significantly lower than the external ground level. Still designing so: 1) with a cavity wall full of Rockwool, can I run the slab dpm through the internal leaf (into cavity) and up to internal wall dpc? 2) would this be ok with BCO? 3) does anyone know of a...