The Helios Fans WHR 2÷50÷25 30 is a warm water heater battery designed for integration into duct systems, featuring flanges on both ends for a secure and efficient connection. Its casing is constructed from galvanised sheet steel for durability and corrosion protection. Inside, the heat exchanger uses copper pipes paired with aluminium fins to ensure high thermal efficiency. The unit is rated for a maximum operating temperature of 120 °C and can handle pressures up to 8 bar. Water connections are provided with external threads, allowing for easy and reliable integration into heating systems.