Abstract: A sheet metal stove comprising a shell of rectangular shape having a plurality of tubes extending between opposite sides thereof and extending therethrough to receive ambient air for combustion, adjustable dampers on the opposite ends of said tubes and slots therein between the ends to discharge air into the stove by convection, a grate supported by said tubes, a deflector sloping upwardly and forwardly from said grate, a door for the front of the stove having adjustable dampers therein to promote long burning of fuel, air heating conduits adjacent opposite sides of the shell to accept ambient air at the bottom and discharge heated air at the top, and a manifold on top of the shell to utilize combustion products before discharge to a flue to heat additional ambient air.