Hi Jonathan,
we were looking at an air source heat pump on the green grant scheme. We were told we’d need space for a hot water tank.
Our boiler is currently in the bathroom - we will be replacing it with the water tank when we finally go ahead. I have been told we will need a larger cupboard than the one we have for the boiler.
I don’t think the hot water tank has to be in the bathroom - but it’s worth considering where in your house or loft .
Hope this helps
Catla