I can pretty much guarantee you will not see a cooler wood burning stove today than this model from Bullerjan. It’s made of a high grade steel with a number of different outer casings available like the uber-awesome flames model above. The steel tubes you see protruding on top and bottom are also functional; cold air is drawn in from the bottom, heated in the tubes by the fire, and warm air expelled through the top resulting in a more efficient furnace. It also looks kinda like a hot rod car engine which is a plus in my eyes.
HY-C MH-6R Magic Heat Bottom Crimp Heat Reclaimer for Use with Wood Burning Appliances, UL Listed, Fits 6" Single Wall Chimney Pipe
JYDMIX Stove Fan- 4-Blade Heat Powered Wood Burning Stove Fan for Log Burner/Fireplace-Quietly and Efficiently Heat Distribution