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I have already balanced the system - after fitting new windows in the old bit of the house, the new extension doesn't get up to temperature. One solution is to fit a thermostat in that room so that it can keep the heating on for longer until it also reaches temperature. What I am talking...

Is it possible to buy a flow sensor to retrofit to an existing CH system? I know some modern boilers have a sensor that will run the boiler whenever any TRV opens and water can flow through the radiator. It would probably solve the problem that some of our rooms warm up more slowly.