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Thanks boilerdoktor That's a great suggestion - there is air coming out of the PRV and so I'd be surprised if it's that. I still think it's the boiler but the Ferroli engineer said there was no way any leak in the heat exchanger could be boiled off in the flue and released as condensation...

Thanks Agile Is it normal for the flue to be dripping every few seconds when boiler in use? I think that may be the problem which I guess is something to do with the heat exchanger / condensate? I'll collect half a bucket full in a few hours + whatever is going down the condensate pipe...

Nige - thanks you're right there is a risk of that although the plasterboard is dot and dabbed onto thermalite blocks and so with that much water I was guessing I'd have spotted something by now. Gazdaz - how on earth did you diagnose the pin holes?? I had considered loss into the hot water...

Thanks for the note. We seem to have 2 vessels - one on the floor (with pressure gauge) and one suspended off the pipework near the hotwater tank. The engineers had a glance at them both but since there was no sign of water coming out of the over-pressure release pipe outside I think they just...

Thanks for that - my hunch is that it's the boiler. We've had loads of problems with it since moving in 3yr ago. It's now 10yr old. The Ferroli engineer said any heat exchanger leak would come out of the condensate pipe. There's nothing there - but if it could be evaporated in the flue...

Hi all I am at my wits end and am seeking some practical advice on where to turn next. I live in a converted barn – most of it is open ceiling, with 90% of the central heating pipes running under the celotex that insulates the roof and above the block work that the dry lining is stuck to...