Abstract: A heat source which is particularly adapted to be utilized for a food warming unit or the like. The heat source includes a fuel tank which is adapted to be filled with a liquid fuel and includes a recessed chamber with one or a plurality of burner units disposed therein. Associated with the recessed chamber is a spring-loaded, hinged cover which is adapted to be automatically released to extinguish the burners upon certain disturbances to the fuel tank, such as by being tipped over, lifted, or dropped. The unit also features a unique burner construction which greatly reduces costs compared with known heat sources.