The Helios Fans WHR 4÷100÷50 is a warm water heater battery designed for duct system installations, featuring flanges on both sides for secure mounting. Constructed from galvanized sheet steel, the casing ensures durability and corrosion resistance. The heat exchanger is equipped with copper pipes and aluminium fins to provide efficient heat transfer. This unit supports a maximum operating temperature of 120 °C and a pressure rating of up to 8 bar. Water connections come with external threads to facilitate easy and reliable integration into heating systems.