The Brinkmann Portable Space Heater I puchased from Amazon.Com is not a very useful product. I purchased this product as my son wished to go on his first deer hunt with me. The heater did not fully ignite (whole face should be red, not portions of it) I ran the heater in our large Teepee style tent. When my fellow hunters arrived the next morning, they woke me up and got us out of the tent as the smell of propane was heavy in the tent. My son and I had headaches for hours after getting into fresh air. Upon inspection, it was found the face was not fully igniting allowing unburnt propane to enter our air. On the positive side, the heater did put out some heat allowing my son to warm his hands and feet. I will not be using this particular product again. To add to the product, the built in thermometer did not work. Spend the extra money and purchase a buddy heater. My hunt buddies had one which put out more heat, worked wonderfully, and did not cause headaches or nausia.