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My system has 22mm from boiler along ground floor same on the up stairs to where it reduces to 15mm this then runs the length of the house, at every rad it reduces again to 10mm micro bore. my question is, do i leave the system that way or is it worth changing the micro to 15mm right up to the...

As title I am looking for a Condensing combi boiler with at least 130.000btu c/heating out put, can any1 help or point me in the correct direction cheers Paul