Hi if i have my heating boiler on minimum setting do the radiators only get part warm or do they get warm all over radiator, also why only some of my radiators not get heated up i have 3 new ones one gets warmish the other 2 stay cold (they dont need bleeding) Thanks for your help.

mark, December 2011

Radiators will get warm all over, a slight difference between input side and output, as it looses heat on it way across, that is what it is supposed to do, If warm at bottom cold at top, that is when they need bleeding. The 2 that stay cold, check valves, the inlet or outlet side might be closed, thermostatic valves easy to see if they are open, other types you will have to turn to find out. Same with the one that gets warm.

SD, December 2011