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How do I isolate the boiler? (sorry, this is all new to me)- really grateful for all suggestions. Ill try the balloon idea aswell- thanks.

its a RD532i, according to the book. Im really clueless as to how the CH system works, and as we arent using the heating, only hot water, didnt know whether it could be anything other than a leak (wishful thinking). As its been going on so long, thought we would have seen evidence of a leak.

Im a newbie, so please be patient. :wink: My Worcester bosch boiler loses pressure, dropping to zero every 3-4 days. I top it up to 1.5. bar . Pressure drops even when heating not in use in summer. Ive checked radiator valves, and overflow pipe, but no water apparent. We are just about to take...