Abstract: A closed furnace vaporizing burner and a feed therefor suitable for adapting to a closed fireplace, transforming it into a liquid fuel fireplace. The invention comprises two distinct portions: The fuel feed comprising the inlet 1, an air-liquid separator 2, an injector tube 3 terminated by two downwardly bent small-diameter tubes 30, a cooling tube 4, a holding and protection tube 13, two protective tubes 16 and 18 or a heat-recovery cooler 39, and a support 10. The combustion assembly comprises an air feed and hearth support box 20, a fan 22, a combustion pot 26, a receptacle 27, horizontal disks of grid, or expanded metal, or perforated sheet metal 31, radial fins 36, a transparent ceramic glass tube 38, a reflecting screen 47, and in a variant, air injection rings 41 and transparent ceramic glass tubes 42.