"My primary heat for the last decade has been kerosene heaters, so I am familiar with the heaters.
Last winter I decided to try Dura-Heat, and it worked ok for a couple of months. Then, for no known reason (and I was meticulous about keeping it burnt off and cleaned) when the wick was lit (with knob all the way to high), it would, within 5 minutes start burning so low it was almost impossible to see the flame.....and, of course, it didn't put out very much heat at all.
Plus, it would smoke and turn the top all black.....none of my other heaters have ever done that. I took it all apart, thinking maybe I had not reassembled it correctly after a thorough cleaning, but that wasn't the case.
It continued to follow that pattern. .....and, yes, I've always used nothing but 1-K clear kerosene.
I still have the heater but it's just sitting collecting dust. If anyone knows how to solve that problem, I would appreciate hearing about it.
If there is no way to resolve this, I will make sure to buy a different brand next time.........and, yes, I"ve tried out numerous different brands of kerosene heaters."