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The noise generally comes from all over the place, from the boiler itself, the rads, pipes. Louder than last year. The system as a whole is at its noisiest when it switches itself on/off during the night. I have the main thermostat knob set to about 22 so that the central heating comes on and...

Noisy, clunking pipes and boiler. Very hard water area in Kent so I guess I need to flush the whole system and use a de-scaler of some sort. Anybody know how much this generally costs to have done by a proper central heating specialist (i.e. not a cowboy)? Can anyone recommend a good one in the...