4-way Ventilspulen-21s4, De Dietrich 7673328

The 4-way valve coil 21s4 is an electromagnetic coil used to actuate reversing valves in heat pump and HVAC systems. This coil is a critical component among boiler spare parts and burner spare parts, enabling the switch between heating and cooling modes. Its reliable construction ensures consistent operation in gas burner parts and other heating equipment components. When servicing a heat pump or multi-function system, replacing a worn coil with this model restores proper valve function and system efficiency. A must-have for comprehensive boiler maintenance and repair parts.