Hello My house has an old but conventional (as it was then) gas central heating system. It has a pumped supply to the radiators but the primary hot water supply to the hot tank is gravity fed and also feeds the bathroom radiator. All is working well except for the bathroom radiator which gets only moderately warm at the top but gets progressively colder towards the bottom. The hot water tank contains hot water from top to base and its base and the radiator base are on the same level. I've tried a number of things to identify the problem - valve seems to be working ok - bleeding the radiator to no avail. Any ideas would be appreciated.