The Oil Classic model is Kuma’s original oil stove, and the one that pioneered outside air ready oil stoves.  Heating with oil can still be a good value when the alternatives are expensive propane or other purchased fuels.  However, maximizing efficiency when burning oil is important in order to maintain value and reduce environmental impact.  With the Oil Classic, you’ll have peace of mind knowing that you’re burning oil at one of the highest efficiencies that any natural draft oil stove offers.