thescruff
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Did the vessel hold the charge when you up it to 0.5.
If it did then the vessel is too small for the system.
How many radiators are on the system and what sizes, you need to work out the water content of the system, or just add another vessel thats remote from the boiler, say 10-12 litres, it can be cut into the heating pipework anywhere on the return, nearer the boiler is best.
If however the pressure rises when the boiler is off then you need to say.
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