Duratherm : Solartherm Direct 100L 400kpa-S100D : Solar Geysers

In a direct solar system, the water is heated by circulating water from the storage vessel through the solar panels.  This can be done naturally via thermo-syphon or through a pump.  The system is simple and cost effective, however it must be noted that the pressure in the storage cylinder will be transferred to the panel which makes this unsuitable for some solar panels.

This system is also not suited for areas where frost and very low temperatures occur because of the possibility of the fluid in the panels and pipes freezing.  It must be noted that there are controls available that reverse warm water through the panel to prevent freezing, however this could be costly.

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