Abstract: Provided is an apparatus for burning biomass fuel sources, such as a fire pit for burning wood pellets. A fire pit of the present invention may include a burning chamber having a floor and an opening at the top, and a secondary chamber having a bottom, at least one air intake, and at least one air escape. The secondary chamber may be heated by the burning chamber. The at least one air intake may be located near the bottom of the secondary chamber, while the at least one air escape may be located near the top of the burning chamber. In addition, the primary chamber opening may guide flames out of the burning chamber. The secondary chamber may also include a roof which may overhang said burning chamber.