Thanks Jeff for conducting the test and by doing so I've learned a little more about cat stoves. You pointed out the lack of smoke which for the non cats thats a real good thing. I too have noticed they take off fast and put off very little if any smoke. I pulled the trigger on another Elm and for awhile was going with the cat version. But Steve talked me out of it. So for now since I'm getting an easy 10-12 hrs on a load I'm happy with that.