depending on the boiler, there should be a filling loop (usually a silver flexible tube with a control knob each end. if not directly under the boiler itself there should be a tap, turn on taps and wait untill arrow on gague reaches 1.5 bar (middle of green section)
dave
December 2012
hi can u tell us the type of boiler brand as they all diffrent
kash
December 2012
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