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Sorry to ask this question again but i didn't get any replies first time. My house is 100 feet long with an oil fired boiler at one end (28kW) and 24 radiators. There's a single grundfos pump on the return leg to the boiler. Gravity fed, un pressurised, doesn't heat the hot water. The...

My house is a long (100 feet long) and thin (18 feet wide) barn conversion. A elderly potterton oil fired boiler sits at one end and 24 trv controlled radiators hang off the send and return legs of the boiler. Each radiator has a 10mm feed and return, and the boiler send and return pipes start...