The Sengoku HeatMate 10,000-BTU Portable Indoor/Outdoor Omni-Radiant Kerosene Heater doesn’t take up much space, but provides 300 square feet of warmth. It’s also safer than most kerosene heaters.

He said some businesses have kerosene heaters. "They had a kerosene heater inside the tent so not only do you have an open flame device but you also have a flammable liquid inside that tent," he said.

The Arctic heater burns liquid and solid fuels. • Space Heater, Small (NSN 4520-01-478-9207): The small space heater is ideal for use in smaller tents such as the four-man Soldier/crew tent.