4 Reviews. £117.99. Efficient Diesel Heater: Heater Power: 2KW; Rated Voltage: 12V; Heater Working Temp: -40℃~+50℃; Oil Pump Working Temp: -40℃~+40℃. We have got you covered with this diesel air heater to warm your car and remove the windows' frost on cold winter days. With fast heating and low noise, the aluminum heater runs smoothly