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I have a British Gas system but don't use it and don't want to. The transformer in the box hums loud enough to be annoying at night. How can I shut down the whole system?

The house was built in 2003, boiler must be that old. I have no evidence of any repairs. Cheers.

I have a Potterton Suprima boiler with a Megaflow unvented mains pressure water heater. The pump has been running continuously except for a couple of seconds every minute or two. At the beginning and end of the two seconds the boiler clicks. Usually the boiler's LED flashes slowly green, during...