my open plan living room just doesnt seem to get warm enough and i reackon its down to the radiator but i,ll just run the room sizes first and see what you think. the room is north facing 17ft x 13ft and 7.5ft high,it has a double glazed 8ft x 4.5ft window at front and dividing french doors.stairs run along side wall leading to landing which has a 4ft x 4ft dg window.theres 1 radiator positioned under the 8ft window which measures 2000 x 600 its a double but without any fins in the middle just a small gap of around 20mm. the radiator does get hot but the room seems cold would a double k2 (double convector) be more suitable or would i just be wasteing my money.any other advice would be much appreciated, just thaught i,d add all my heating is run off a gravity fed ideal classic boiler if that makes any difference