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Forced circulation system

It is a type of heating system.

In a forced circulation heating system the antifreeze liquid circulates through an electric pump driven by an electronic control unit, rather than circulating naturally. The control unit stops the circulation when the liquid temperature coming from the panels is less than the temperature in the storage tank, for example during the night. The forced circulation can be used not only for heating water but (where possible) it can also be used to supplement the heating system.