In South Africa frost forms on the interior plateau during the winter months. Frost is most likely to form in April and October. The eastern and western plateau is most affected by frost during these months, as indicated on the frost map. 

Solahart's solar water heating systems are closed circuit collectors filled with a propylene glycol, a non-toxic antifreeze additive. By introducing a collector protector into the closed circuit, the fluid's freezing point decreases to temperatures below -10ºC, making the Solahart systems the ideal solar water heating solution across South Africa.