Frost Tolerant Systems For areas which experience frost or snow and perhaps have less than reliable water quality, the Edwards LX Series 2 system and the GTS Series 2 system is the only choice. It uses the highly efficient heat transferring properties of a special anti-freeze fluid to transfer the absorbed energy to heat the water indirectly. With an 'indirect system' water does not pass through the collector panels, instead the anti-freeze mixture is circulated from the collectors through a stainless steel heat exchanger, transferring the heat into the water. The benefit of this 'indirect' heat exchange process is that the system can be used confidently in frost areas, without risking damage to the system; it offers protection against freeze damage in conditions of up to minus 8 degrees Celsius.

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