Indirect systems rely on Glycol as the heating fluid in the system, for this type of system a special geyser is required that is able to transfer the heat to the water in the tank. Indirect systems are freeze resistant and are able to withstand adverse water conditions.

Pumped systems use a Solar Collector positioned on the roof to absorb thermal heat and rely on an electrical pump to transfer the heated fluid into the geyser positioned out of sight inside the roof. Pumped systems are aesthetically pleasing and in some cases the existing geyser already installed in the house can be converted to solar.