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Cheers - good to know I'm on the right track. I've done all the obvious checks and with that amount of pressure loss it would be fairly obvious. Also got 3 bottles of nasty perfume for £3 from The Range but wasn't able to smell anything. Finally bit the bullet and got someone from a leak...

Ah sorry got confused - no the cold system test with the 0.5 bar drop in 1 min was indeed with the boiler connected/un-isolated but off...

Thanks for the response - meanwhile I've done exactly that: re-pressurized the cold system to 1 bar, bled all radiators and with the boiler off I lost 0.5 bar in 1 minute!! Suspect I have a massive leak somewhere under the floor. Of course everything is either tiled or covered in laminate :(

So if the 170 ml of water are a result of a leaking heat exchanger that wouldn't account for such a pressure drop would it? Sorry for my ignorance but I can just about spell "boiler" and have a very basic understanding of how my heating system works :)

Sorry forgot to mention during that hour I lose around 170 ml of water coming out of the condensing pipe I believe? Not sure if that's the same as the PVR... In any case I guess 170 ml would not account for a 1 bar pressure drop...

Hi, I have a 2 year old Viessmann Vitodens 050-W gas condensing boiler and a problem with keeping the pressure in the central heating system. When I pressurize the system to 1 bar and isolate the boiler the pressure holds so I assume there isn't a problem with the boiler itself. When I...