Traditionally the wet rooms are stacked above each other, assisting gravity fed water (hot and cold) and in particular drainage, however there are plenty of exceptions.
As regards the inline hot water, that could be added to this list:
Traditionally the wet rooms are stacked above each other, assisting gravity fed water (hot and cold) and in particular drainage, however there are plenty of exceptions.
As regards the inline hot water, that could be added to this list: