In a  split system solar collectors and water tanks are separate. Collectors are usually mounted on a roof while the tank is inside the building. They look aesthetically sound since the solar collectors are flush on the roof. It is also possible to retrofit solar collectors by connecting them to an existing electric geyser. However one needs a qualified fitter to do this. It is also possible to install multiple collectors and connect to one big tank (for big projects).

View Full specifications: Water heaters\Split system.pdf