This heater worked great for the first two months, but at the beginning of the third month, the knob started malfunctioning. It either didn't want to turn or it would turn but bounce right back. Also, in the beginning of the third month, the fumes got to be strong, and by the middle of the third month, the fumes were horrible. It was also at this time that it would not light up properly and warm the room very good. I was laying right in front of it and was still freezing cold. I am 57 years old and have used kerosene heaters for decades with no problems. So, it is NOT that I do not know how to use one. The knob is defective, and the heater comes with a really cheap wick that will only last a couple of months.