The solar collectors convert solar energy directly into heat, which heat up a water-glycol mixture inside the collectors. This frost-protected water-glycol mixture is circulated via piping through a heat exchanger inside a water storage tank, where the heat energy is transferred into the water inside the tank.
Now solar-heated hot water is available for domestic hot water usage, or process heat or any other heat energy requirement.

Solar thermal energy can also be used for large-scale process heat, more at www.SOLID.at.