Abstract: A liquid fuel vaporizing burner comprising a combustion chamber, a fuel inlet, a primary air inlet, a secondary air inlet, and a microprocessor controller. The fuel inlet communicates with the combustion chamber. The primary air inlet communicates with the combustion chamber and is interactive with the fuel inlet. The heated secondary air inlet extends about the combustion chamber in heat exchange relationship. The combustion chamber has walls of generally heat conductive material. The combustion chamber comprises a combustion region and an exhaust region. The secondary air inlet opens at one end to the atmosphere and at its other end to a mixing passage. The microprocessor controller is electrically connected to thermocouples about the burner, to the primary and secondary air inlets, and to the fuel inlet.