The Helios Fans WHR 4÷60÷30 35 is a warm water heater battery designed for duct installations, featuring flanges on both sides for secure mounting. Its housing is made from galvanized sheet steel, offering durability and corrosion resistance. The heat exchanger is equipped with copper pipes and aluminium fins to provide efficient heat transfer. This unit is rated for a maximum operating temperature of 120 °C and can handle pressures up to 8 bar. Water connections include external threads to ensure straightforward integration into heating systems.