How the system works

A typical household solar heating system consists of a solar panel (or solar collector) with a heat transfer fluid flowing through it to transport the heat energy collected to somewhere useful, usually a hot water tank or household radiators. The solar panel is located somewhere with good light levels throughout the day, often on the roof of the building. A pump pushes the heat transfer liquid (typically Glycol propylen) through the panel. The heat is thus taken from the panel and transferred to the solar boiler.

Since the glycol propylen network is thermally isolated (i.e. will keep temperature unless transfered to boiler) the collector will be efficient under light even in winter.  

For efficiency calculation, you are welcome to visit www.soltherm.org

or to check on the following file: