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I have a sealed CH system and at the moment it seems to be losing pressure at the rate of about 0.5 bar per week. There are no visible signs of leaks and British Gas, who we have a service contract with, want to put leak sealer in the system to see if it stops the pressure drop. My question...

Hello, My gas CH system pressure - the pressure gauge on the boiler (it's a sealed system) - seems to drop slightly over time - say about one eight of a bar over the course of a month - is that normal or does it suggest there might be a leak? How often should a normal system be topped up...