When nights drop below freezing and you’re done pretending to enjoy “roughing it,” the LF Bros N2-T 5 kW diesel heater is the civilized way out. It runs on 12 V (or 24 V with an adapter) and includes a 110 V transformer for home or garage use. Output runs about 4,700–17,000 BTU, fuel consumption 0.18–0.53 L/hr, and it’s rated to –40 °F. Plateau mode keeps it happy up to 17,000 ft.