A couple of weeks ago my wife and I went up to Rochester MN to the Gold Rush flea market. There was a dealer there displaying an OWB. Can't remember the name of the burner (It was made in Canada) but the guy seemed to have an answer for all of my questions. I have a non EPA stove presently and this one according to him was EPA approved. Now most of the videos that are posted on here always make reference to the blue darting flame at the top of the firebox. So when he showed me the inside of his burner and said that the secondary burn takes place in roughly a 16 inch diameter ceramic(?) chamber located in the BOTTOM of the burner. I was wondering if all of these stoves work on this same principle? This is the first EPA burner I have ever seen in person so I have nothing else to compare it to. Is this indeed an EPA certified burner I was looking at? He did make the comment that with the cost of LP he took the plunge last year and bought this burner and was so pleased with its performance he decided to become a dealer. He said that he was happy that he only burned half of the wood that a non EPA stove would have took to heat his house. Gave that statement a little thought and couldn't resist to ask him if he has only burned wood for one year how in the heck can you say you only burned half as much if you have no idea roughly how much it would take with a non EPA burner. Couldn't help but smile with his come back "Well that is what the factory told me".