As good as it sounds there will be all sorts of hurdles I imagine...
Who would own it and pay for its installation?
who would be responsible for it should it go wrong or cause damage to the existing roof?
what if the patient is transplanted shortly after? Could the patient have an option to buy?
I think a better option might be one of the reducers that takes the voltage down from 240 to 220/210v?
Manchester University NHS Foundation Trust