Hi, This is my gravity fed pellet burner. The air intake and the feeding rate can be adjusted depending on the intensity of heat needed. Set to the minimum feeding rate, i get over 8 hrs of heat with a 40 pound bag of wood pellets. Together the rocket stove and the burner work better then i expected, Wood pellet are cheap and easy to find. Since wood pellets are made from recycled wood, i guess this is somme kind of green way to heat my garage..