I was wondering if somebody could help me out on this. When we are turning on the central heating our radiators only go lukewarm (bottom gets hot but top not). After a while (1 or 2 hours) being on all the radiators get cold and do not warm up for the rest of the evening. That way the house stays pretty cold as it doesn't get a chance to heat up.
Any help is greatly appreciated.
Any help is greatly appreciated.