Portable diesel air heater. 

Portable Diesel Air Heater Planar 2D – 12V is a self-contained heater comes in a crushproof rain-resistant case. Runs on diesel or kerosene and 12v DC.
Burns just 2 liters of fuel for 8 hours!
For heating up to 25 ft boats, campers, vans, camp tents, motorhomes, etc.
Take it with you when you go winter camping, hunting, ice fishing. Anywhere you need instant dry heat!