You should have a pipe that feeds into your boiler, on that pipe should be a small value, usually sits 8 inches below main boiler, open this value slowly till your bar reading shows one and a half bars of pressure, that should be more than enough.
William farquhars
December 2010
assuming this is a combi boiler you would use a filling loop if one is not already attached to the boiler
A1
December 2010
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