The Helios Fans WHR 2÷40÷20 is a warm water heater battery designed for use in duct systems, featuring flanges on both sides for secure and easy installation. The casing is made from galvanised sheet steel, offering strength and corrosion resistance. The integrated heat exchanger includes copper pipes combined with aluminium fins to provide efficient heat transfer. Capable of handling temperatures up to 120 °C and pressures up to 8 bar, the unit is equipped with external threaded water connection pipes for straightforward system integration.