I'm more concerned going forward that I will get hammered on water charges if the leak is on my part.
Thanks
But how do I know how long to turn the black tap for?
Brendan
An expansion vessel has a rubber diaphragm in it and on one side of this is a wet side (the heating system side) and an air side.
Heating system having 1.3 bar and air side 1.0 bar.
Air leaks from the schrader valve lowering that side of pressure, thus the wet side expands more into this, slightly lowering the wet side pressure.
The air side must be topped up annually, usually carried out during the boiler annual service.
If neglected, it can emulate a leak in the system and lead to total lack of system expansion. Water from the system can then be lost from the boiler pressure relief valve.
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