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Thanks for reply bster. I did wonder about that, but it is level (within a mm or two!)

Hi, I've got an upstairs radiator with 12 vertical tubes in a kid's room. When the CH has been running for a while all other radiators are hot (inc another one in the same room), but on this one - only a few of the tubes are hot, some tubes are warm and some are cool. There is no particular...