If the boiler has an option to slow it down this may solve the problem.
Boiler water pump noise.
If the humming stops and you want to keep the pump set at a lower speed just check that the radiators heat up properly and the boiler isn t cycling too fast.
Check the circulation pump.
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Otherwise you re likely to find it in the airing cupboard or under the stairs.
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If the well pump is a submersible unit located inside the well normally the only noise you ll observe in the building is the clicking of the pump control relay s that turn the pump on or off and possibly a modest sound of water entering the water pressure tank or building piping.
Why a central heating pump might be noisy.
Came out to the pump on the boiler making a weird noise.
If the pump isn t already set to the lowest speed push the dial all the way to the left and wait to see if the humming noise stops.
In most cases the central heating pump can be found pretty close to the boiler so that it can begin pumping the water as soon as the boiler is done heating it up.