Van Life Webasto 4kW Gasoline Air Heater Kit for Promaster Sprinter 90-3-0019Genuine Webasto Air Top EVO 40 Air heater kit. With an output range of 5800 BTU to 11942 BTU (1. 7 kilowatt 3. 5 kilowatt with boost to 4kw) the Air Top EVO40 series air heaters can provide heat for up to 16 hours on 1 gallon of fuel. Investing in a Webasto gasoline air heater will save fuel, save maintenance, save money and save pollution. We take the factory packaged kit and add a specific assortment of Genuine Webasto accessories to give you a 1