The Helios Fans WHST 300 T38 is a thermostat valve with a remote sensor designed for precise regulation of water heater batteries in ventilation systems. It allows stepless adjustment of the water flow to maintain a consistent supply air or room temperature. With a maximum flow capacity of up to 300 litres per hour, the valve enables accurate and energy-efficient temperature control, making it ideal for continuous heating regulation in various HVAC applications.H