If someone gets sick, at base-camp, they may have to be isolated in another room – that room may have to be heated. Or, if an away-team is gone and the temperature drops below 45 degrees F they need heat in their tent that night.
I like this small heater since it can run all night on one propane tank. It is small enough to take in a backpack and used in a tent. Trying to keep a tent warm on a very cold night is a very difficult task that this device can solve.
The 1-pound propane tank can be refilled from the 20-pound reservoirs in your backyard.