Yes, the Little Buddy Heater works in tents. It’s safe to use in any stationary space. Just keep the heater aimed away from the tent walls for safety. 9,000 BTUs is a lot of power, and you don’t want to melt your sleeping space.
Tents are also great for ventilation. The chances of carbon monoxide building up in a semi-permeable fabric tent are much lower than in other enclosed spaces. A propane heater like the Little Buddy is a great option for keeping your tent warm.