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In a hydronic heating system, a flow switch plays a crucial role in ensuring the proper operation of the heating system by responding to the actual flow of water. When water circulates through the system, the flow switch detects this movement. If flow is detected, it activates the heating equipment, such as a boiler or pump, ensuring that heat is delivered where it's needed.

The operation of the flow switch is vital for preventing issues such as overheating or damage to the system due to insufficient water flow, which could lead to hot spots or vaporization of water. By ensuring that the system is activated only when there is sufficient flow, the flow switch helps maintain efficiency and safety within the hydronic system. This function is fundamental because it allows the hydronic system to respond dynamically to the varying demands for heat within a building or space, ensuring comfort and operational integrity.