I've got the "old school" 118 from Jotul and I absolutely LOVE it. Suffice it to say that I am now fully addicted to burning wood inside of a wood stove. I liked burning wood before, but now that I've got a stove, it has been taken to a whole new level. Anyway, I was curious about how efficient my old stove is. I know that I don't have the secondary burn, but I tend to believe I'm really getting some good efficiency out of it - when I finally burn it correctly. It seems that when I'm in the 200-450f mark, it is a typical inefficient beast, but when I get up to 500+f, I don't see any negatives and this thing is throwing out the heat and I barely see any smoke coming out of the chimney. I'm assuming this is a good thing?