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the flow restriction was mentioned each rad is teed off separately i suppose so as not to see large pipework on the drops

I'm a humble sparky installing a combi boiler onto an existing conventional system .the main flow and return pipework are 22mm but the rads are tapped off in 10mm microbore i have been told by a gas fitter that i will have to change the micro bore pipework otherwise i will have problems is this so?