Heat, a wonderful feeling. And these 2 heaters are what I constantly use both at home & in the field. The Buddy on the left is small and uses very little propane. It’s perfect for a tent or small bathroom. The Big Buddy will heat a large room or a large tent and it is easily connected to a 5 gallon propane tank. Both heaters serve their purpose and after years of use, continue to be one of the best investments that I ever made.