The efficiency of a wood burning stove is enhanced in a number of different ways. The first is a means to first preheat air in the lower part of the airspace in the jacket before the air passes through heat exchange tubes in the firebox. The second is to discharge the hot air in the upper part of the jacketed airspace along with the hot air from the heat exchange tubes into the enclosure to be heated. The third is to deflect the discharged hot air downward to decrease the temperature differential from floor to ceiling in the enclosure being heated. The fourth is to deflect the fire and hot gasses from the firebox away from the flue so that they must pass parallel in heat exchange relationship with the top of the stove before they can enter the flue. A fifth is to provide a second grate below the heat exchanger tubes, which act as a first grate, to catch burning embers which fall between the tubes of the first grate and provide complete combustion of the embers.
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