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Have managed to pump up the pressure to 1Bar from the expansion vessel. How do I add another 1 Bar at the gauge?

Thanks for the quick reply - much appreciated! Sorry for this question (if it seems silly) but where do I locate the expansion vessel/what does it look like and how to top it up to 1 Bar? Any help welcome! Thanks largy

Hi I would like to know what the pressure setting is for a BIASI Gas Boiler (24S) as my boiler has a reading of zero on a scale that goes up to above 3 Bar when the system is on! The black indicator stays at zero whilst the red indicator is at 2 Bars - is this what itshould be or was in the...