The only documentation I could find says its a ASW Huntsman 241. In the diagram the top plate is different than mine and their is no heat transfer tube in ours. The upper box entrance is split evenly and the entrance to the upper chamber is centered and has a small lip pointing upwards in the plating on the back side that looks as though maybe a pipe could lay there. We've used it for 5 years and were considering buying a newer stove however this stove works perfectly, don't fix it if it ain't broke. Does anyone have any info on this and is it EPA certified. Thanks.