To the left is my Buddy Heater, which uses propane gas, bulky, creates condensation in the tent, and has a higher risk to carbon monoxide exposure. To the right, I just received my Teioe electric heater, which has two heater settings, one cool air setting for those warmer seasons, has an auto safety shutoff, and is way more compact. But don’t let its size fool you, it’s heats up fairly quickly, and it costs a third of the price compared to the Buddy Heater.