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To answer an earlier question, the device is definitely a kettle. On my own initiative I have turned off a radiator and made sure that all other radiators are either completely off or on (so that there is no constriction in the system) with the result that the whining has certainly...

Back in March 2000 I had a new Vaillant VHR 24-28 combi CV installed. It worked satisfactorily and fairly noiselessly - we could hear the gentle whooshing of water when the heating was running. Then about a year after, the thing began to make a whining noise which I presume emanates from the...