Application: heat pump systems, Suitable for: floor-standing installation, Vaillant enables the installation of an external unit of the VWL S on flat roofs consisting of: 2x gravel tray 2x flat roof connection pipes 28 mm x 1.5 mm, G 5/4 1x base plate for flat roof installation 1x thermal insulation for connection pipes 4x connecting elements for attaching the gravel tray to the external unit 2x brass screw connections, R 5/4 Vaillant enables the installation of an external unit of the VWL S on flat roofs consisting of: 2x gravel tray 2x flat roof connection pipes 28 mm x 1.5 mm, G 5/4 1x base plate for flat roof installation 1x thermal insulation for connection pipes 4x connecting elements for attaching the gravel tray to the external unit 2x brass screw connections, R 5/4
