The indirect system is used in locations where frost occurs, where the ambient temperature falls below 5°C and where the water quality is poor (more than 600ppm Total Dissolved Solids / Minerals). The system can be used with one or two Solar Collector Panels dependent on the capacity of the solar tank.

An indirect system is where the potable water used in the household (hot water) does not circulate through the solar collector panels, but remains in the solar water heater and is heated through a heat exchanger around the vessel. Propylene glycol is circulated through the solar collector panels, transferring solar energy into the heat exchanger and in turn heating the water in the solar water heater…