Jun 10, 2022 · This 300-watt truck heater connects to the vehicle battery and can be used both as a heater and a cooler. With a weight of 3 lbs, it measures 7.9 x 6.7 x 6.2 inches. CHECK THE CURRENT PRICE 3. Happybuy 5KW Diesel Air Heater The air diesel heater comes with a digital switch remote control, a 10L tank, and an exhaust silencer.