The Helios Fans WHR 125 is a compact water heater battery designed for connection to circular ducting. It has a durable galvanised steel casing, and the spigots are fitted with double lip rubber seals on both sides to ensure compatibility with standard nominal ducts. The heating elements are made of copper with aluminium fins to enhance heat transfer efficiency. This unit operates at a maximum temperature of 100°C and can handle pressures up to 8 bar. For ease of installation, two inspection caps are included on the water connection side.