The Helios Fans WHST 300 T50 is a thermostat valve equipped with a remote sensor, designed for regulating water heater batteries in ventilation systems. It enables stepless control of water flow to maintain a continuous supply air or room temperature within a range of 20 to 50 °C. With a maximum water flow rate of 300 litres per hour, the valve ensures precise and efficient temperature management, making it ideal for consistent climate control in HVAC applications.