Heat dissipation design for combustion devices

A combustion device that allows heat dissipation, comprising:

• a body having a top end, a bottom end, a front end, and a rear end, with the top end and the bottom end on opposite ends along a vertical direction, and with the front end and the rear end on opposite ends along a horizontal direction, wherein the body defines a firebox, wherein the body includes a viewing window, an upper plate, a first air passage, and a second air passage, wherein the viewing window is adjacent to the front end of the body and in front of the firebox, wherein the upper plate is adjacent to a top side of the firebox that is adjacent to the top end of the body, wherein the first air passage is disposed on a side of the upper plate different from that of the firebox and extends from a first end that is adjacent to the rear end of the body to a second end that is adjacent to the front end of the body, wherein an outlet of the first air passage is at the second end of the first air passage and adjacent to the viewing window, wherein the second air passage is adjacent to a back side of the firebox that is adjacent to the rear end of the body and has a communication opening at an end communicated with the firebox, and wherein the communication opening extends along the vertical direction and is at a height higher than a height of a bottom side of the firebox and lower than a height of the top side of the firebox;
• and
• a burner disposed within and adjacent to the bottom side of the firebox.