CHROMAGEN'S thermo-siphon systems are available for:

Warm Climates - Open-loop system
This simple and economic system is suitable for climates where there is no risk of freezing. Mains Water flows into to the tank and then to the lower part of the collector where it is heated. The water ascends in the collector as it is heated and flows on to the tank, and from there on to the user. An electric backup system provides energy during periods of cloudy weather.

Cooler Climates - Closed-loop system
A close-loop system uses a wide-surface heat exchanger and allows adding of anti-freeze liquid. This system also helps to avoid the buildup of scale in the collector. Heated water from the collector flows into the heat-exchanger, and then returns to the collector. An electric backup system provides energy during periods of cloudy weather.