A burner (1) that utilizes venturi action for induction of combustion air. The action of the venturi (11) draws in surrounding air present around the nozzle to supply the necessary combustion air, provide forward moment to the burning gases to distribute their heat, and control the location of the heat release. The burner (1) can thus be used to accomplish fuel gas injection directly into the combustion chamber (50) of an oxidizer, and does not require a separate gas train or suffer from the other various drawbacks typical of conventional fuel gas injection systems. A stable flame is generated, and efficient heat-up accomplished. No extra combustion air is necessary.