The Helios Fans WHR 4÷80÷50 is a warm water heater battery designed for integration into duct systems, equipped with flanges on both ends for secure and straightforward installation. Its housing is constructed from galvanized sheet steel, providing strength and corrosion resistance. The heat exchanger features copper pipes with aluminium fins to ensure efficient heat transfer. This unit supports a maximum operating temperature of 120 °C and a maximum pressure of 8 bar. External threaded water connection pipes allow for easy and reliable integration into heating circuits.