Water-air heater for ventilation systems. Water connection made of copper pipe with external thread. Installation instructions: Install behind the fan at a distance of at least 1 m to ensure even air flow. With ventilation and drainage. Ensure accessibility during installation. Provide frost protection on site. With offset manifolds, floating to absorb thermal expansion. Article: WHP 22-18, Max. flow speed: 3.5 m/s, Installation location: Duct, Installation position: vertical / horizontal, Housing material: galvanized sheet steel, Weight: 4.25 kg, Weight with packaging: 5.4 kg, Duct dimensions: 500 mm x 250 mm, Width: 645 mm, Height: 320 mm, Depth: 110 mm, Width with packaging: 825 mm, Height with packaging: 460 mm, Depth with packaging: 140 mm, Air heater type: Water, Heating output: 17700 W, Mass flow: 792 kg/h, Flow temperature: 70 °C, Return temperature: 50 °C, Max. water temperature: 100 °C, Max. water pressure: 8 bar, Water pressure difference: 11000 Pa