Neighbour's noisy droning boiler?

I would be really grateful for some advice. My new neighbour has had a new Ariston boiler installed and it makes a really loud droning noise - all night (and all day). The noise occasionally stops and starts, but is mostly consistent. I have spoken to her about it but her response is to shrug her shoulders and say she needs her heating and hot water. It's really disturbing my sleep and driving me mad. Is it due to a fixable fault or poor installation? If not, do you think a cover or cupboard of some kind around the boiler would deaden the noise a bit?
Many thanks