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as i said. its a just a scenario . 19 mb inlet working pressure at appliance is fine because 18-20mb i believe is the required inlet working pressure to any boiler

good evening. im due to to take the acs in 4 weeks time and would like some advice. got my portfolio done but the guy i trained with does mainly installs and a bit grumpy!! combi badge says min rate 7kw max rate 25 kw. run hotwater and get 20kw. do inlet working pressure test on boiler reads...