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I just replaced one, the component c3 which I saw referred to in the other posts. Having taken a closer look at the circuit board, it looks pretty battered so I wouldn't be surprised if it has other issues. The buzzing is now continuous (EDIT: it stopped eventually overnight with the heating...

Thanks prl, it indeed turned out to be the circuit breaker for the sockets on the floor below that controls these PCBs. Weird, since there is a separate circuit breaker labelled "water heater". I've changed the capacitor but the buzzing still persists. I suppose it could be another component...

Thanks to everyone for the very informative posts. I have a boilermate ii that has just started buzzing a day or so ago. The buzzing can last for quite a few minutes at a time. Having taken off the cover it seems to be the lower PCB. However before I start trying to replace capacitors, I...