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A water flow switch is a safety and control device used in heating systems to detect the flow of water. This spare part is essential for ensuring that the boiler or burner operates only when adequate water flow is present, preventing overheating and damage. Commonly employed in gas boilers and other heating equipment, a water flow switch helps maintain system reliability and safety. Whether you are performing routine maintenance or troubleshooting a fault, replacing a faulty flow switch can restore proper function. When selecting a water flow switch, consider the connection type and flow rate specifications suitable for your system.