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Hi just been to check a family members boiler and I’m getting just over 25mbar working pressure at the meter and 22mbar inlet pressure at the boiler. Standing pressure is 29mbar and done a tightness test and that is all fine. Also did a gas rate and it’s only only showing as 22kw and the boiler is 30kw. What could this be please? I’m only recently qualified so please don’t bully me too much thanks