The Webasto Air Top 2000 STC Air Heater features a compact construction that can be installed quickly either inside or outside the vehicle. The heater heats the air in the interior or cargo space quickly and quietly, and keeps it constant at the chosen working temperature. Users can choose between recirculation and fresh-air modes. The heater is easy to service and repair. The design and low fuel consumption make the Air Top 2000 STC economical to maintain, the company says.