We had a combi boiler fitted about a year ago, but we didn't replace our radiators, which I think are from the 70's. Unfortunately our system is piped with 8mm ?micro bore? - not sure if that causes issues, but it's been flushed and all is ok.
Should I be thinking about replacing the radiators for new more efficient ones and if so do I replace with the same size, and is there any efficiency ratings I should look for?
I'm not sure if I can mention trade names but what is the difference between cheap ones from screwfix to other more expensive ones.
thanks for your help.