Wile E Coyote, Genius.
Another option is a chinese diesel heater. Has a heat exchanger and is a vented heater, with 12V blower and thermostat.
8KW Diesel Air Heater. Heater Power: 8KW. 【ALUMINUM HOUSING】 - The combustion chamber, the base, and the heat-dissipating fin are all sand-blasted aluminum parts. The 12V air diesel heater is constructed of high-quality aluminum, which has the characteristic of uniform heat dissipation, fast...