It may also be worth asking if manufacturer will attend service/warranty call on an appliance installed in a loft. They may have H&S requirements such as fixed lighting or no rock wool insulation exposed.
Garage is a better option for access but if you put it in airing cupboard I’d say better still. Avoids any moisture issues, likely closer to where water will be required. You’ve got the option to split garage off from tenancy and rent out or use yourself or even convert to living space if they done need access.
Garage is a better option for access but if you put it in airing cupboard I’d say better still. Avoids any moisture issues, likely closer to where water will be required. You’ve got the option to split garage off from tenancy and rent out or use yourself or even convert to living space if they done need access.