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Natural circulation system

In a natural circulation solar heating system the antifreeze liquid, which comes from the solar collector, circulates naturally  inside the heat exchanger jacket that is installed in the boiler. Once the heat is released the liquid returns to the panel to be reheated. The heat exchanger transfers the antifreeze liquid heat to the water inside the boiler. The mains pressure then sends the hot water to the users. Furthermore, a special valve prevents the liquid from reversing its flow during the night.