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So, to continue. I managed to find a local that had a G3 certificate for unvented. I invited him for a look, he said he'd been there before, didn't like the look of the builder and blocked his number. He looked at the wiring, said it might all need to be redone but would cost quite a lot (this...

Thanks Ian, I think this (and the last engineer) is right. I can't see any wiring going back to the boiler, and I don't think that's correct. It's a 125SF (SystemFit). Any pointers to how it should be wired up would be very welcome. I just want to make sure the last visit by anyone is the last...

I suspect not very, for someone competent. It looks complex to me though.

Hi there - newbie here looking for some help. I am not gas safe registered, and not looking to do this on a DIY basis, but I need to know what to tell an engineer when they visit. The boiler is on a Corgi service plan/warranty (which I will discontinue soon). Last summer the property had a...