The Helios Fans WHSH HE 230 V is a hydraulic unit designed to regulate the heating output of a hot water heater when used in combination with a room or duct sensor. The unit includes essential components for precise control and efficient operation: a flow and return temperature display, integrated pump, servomotor, 3‑way mixing valve, gravity brake, thermal insulation jacket, and flexible connection hoses. The mixing valve is operated via a 230 V control signal, allowing seamless integration into heating and ventilation systems that require accurate temperature management.