Thanks for the great Forum! I wish I had know about this site before I purchased a stove 2 yrs ago. I have learned more than I ever wanted to know about the hurdles the EPA makes wood stove manufacturers jump over. Ratings and efficiency completely confuses the consumer on how these new stoves perform, especially the smaller wood box size stoves, less than 1.5 cubic feet. This is my first Thread after posting a review of my 2 yr old Buck 18 in the review section. I bought a BUCK 18 insert and have several questions about the design, use and "real world" efficiency. I previously owned an older pre-EPA BUCK in another home.