http://en.wikipedia.org/wiki/Jetstream_furnace The Jetstream boiler was built pre EPA regulations and still exceeds these requirements! It was one of the first commercially built gasification wood boilers and can likely match many of its modern counterparts in performance. Its production was very short lived. From 1981-1983 and only around 900 or so units were produced. What I would like to find out is how many may still be in use? Do you still operate one, have a spare, know of one in use, sent yours to the scrap pile or have used one.