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All Solahart solar water heating systems, where the tank is roof-mounted, use the Thermosiphon principle to collect heat from the sun and transfer it to your hot water. The Thermosiphon principle is based on two naturally occurring phenomena:Dark objects absorb heat

Hot water rises
All Solahart collector panels are coated with a dark, heat-absorbent surface. This coating absorbs the sun’s rays and heats the fluid in the collector panel. As the fluid heats, it rises to the top of the collector panel and into the tank where it displaces cooler fluid which flows in to the bottom of the collector panel where the process is repeated.

The greater the temperature difference between the fluid in the collector panels and the water in the tank the faster the flow between them.

In open circuit systems the fluid in the collector panel is water while in closed circuit systems a special antifreeze fluid is used.

Open Circuit System

When heated in the collector panel, it is circulated in a jacket around the tank to transfer the heat to the water inside. Closed circuit systems are recommended for frost prone areas or in situations with poor water quality.

Closed Circuit System

In this way Solahart Solar hot water systems constantly soak up the sun’s energy to maximise your energy savings.

With a Solahart Thermosiphon solar water heating system you can choose from a range of boosters including in-tank electric or gas boosters to ensure you always have hot water on tap even on cloudy days.