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Can anyone give advice re replacing single valve microbore system? If you are a heating engineer and were replacing the boiler to a combi and the radiators to an inlet and outlet (or valve at each end- not sure of the technical jargon here). would you also replace underfloor pipework to prevent...

Can anyone offer me some advice. I have a microbore heating system that doesn't heat hot water or one radiator, and have been advised that the system has a negative pressure. I require to replace the boiler to a combi and replace all radiators with single inlet and outlet valves as opposed to...