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There has been a balloon over the PRV outlet pipe for 2 weeks with no sign of water loss, therefore I don't think this issue has anything to do with the pressure vessel lacking charge. Unless I'm missing something?

I've spoken to another plumber who said that if the main heat ex was leaking that water would be dripping freely from the boiler casing, rather than into the white condensate pipe. Can anyone confirm if this is actually correct?

It's strange then, because the boiler will fire when the pressure is below 0.5 bar. When it does, the pressure will rise to 1.8 bar within 10 minutes or so and stay there the whole time the boiler is on. Thanks for the advice regarding isolating the boiler - i'll arrange for a gas safe...

I have a sealed central heating and hot water system running off of a Alpha CDR18 boiler. It has been experiencing significant pressure loss (from ~1.0 bar down to 0.2 bar) after the heating has been on and the water cooled back to room temperature. No water loss from the PRV (balloon put...