The company’s passive systems are distinguished by their technological superiority, steady performance without heat losses and double life span. In passive systems, the storage tank is ‘close-coupled’ to ﬂat thermal collector panels. The system is normally ﬁxed on a roof but can be ﬁtted to any convenient and appropriately facing stable structure that gives maximum exposure to the sun.
The system operates on the thermosiphonic principle where collector panels, coated with a solar selective surface, absorb the sun’s rays, heating the water in the panels. As the water heats, it rises to the top of the panels and into a tank, displacing cold water, which is then sent to the bottom of the panels – the process is continuous.