The unit works great, makes very good heat. The owners manual and operating instructions are not very clear, and dosnt explain all of the functions very well. Watch a couple of online videos from other purchasers to learn more. The one draw back on mine is that when you turn the temp setting down the exhaust starts to smoke heavily. When the unit is running on full blast it has no visible exhaust. I use the heater for my work shop and it does a great job, and uses very little of the battery power.