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OK thanks, gas4u. There are two valves under the boiler, 1 with a black plastic 'flag' handle, the other with a red iron wheel. My guess is the black one's the feed and the red iron one's the drain, so I'd turn off both, disconnect the linking pipe from the black one and connect it to a hose...

The smallest bedroom in our house gets too hot if the radiator's on, so that our son falls asleep instead of doing his college work! We have a combi system with a Potterton Combi 80 in the garage. How can I fit a thermostatic valve to this bedroom radiator in place of the existing one...