Fisher wood stoves have been around for quite some time now. Fisher wood stoves could put out as much as 60 to 80 grams of smoke per kilogram of wood burned. New wood stove puts out just 6 grams of smoke per kilogram of wood. That is ten times less than an old fisher model. To take a look at some or purchase some go to http://www.wood-stove.org/fischerwoodstove.html.