Getting info on upgrading the water supply to feed a new combi. Going to replace the old lead pipe with newer blue plastic. Waterline are putting
22mm from the mains to our stopcock. Some-one has suggested to hubby that we put in 25mm from there and reduce it back to 22mm at the boiler.Would this really increase flow rate? IF so can some-one explain the science of that?
TIA Suzanne