I have never had a cat stove before, (last stove i had was a VC Vigilant) well, we have been having small "break in" fires for the last 2 nights and tonight we cranked up the fire and i closed the main damper cut the air down to halfway and engaged the cat.....wow...the flames got lazy and had blue wisps of color and all of a sudden some great heat started to crank out of the stove! It was a completely different animal from the last 2 nights. I was burning small splits and a couple of biobricks and it was really nice to see how this stove could easily go for hours on a few good splits of hardwood. Right now it has a bed of red hot coals and it will probably last for at least a few more hours. Nice....