A heater (2) includes a base (31) formed with a receiving space (311) for receiving a fuel material (200) that is to be combusted, and a heating unit (4). The heating unit (4) includes: a flow guide component (41) disposed on the top side (312) of the base (31) and having a through hole (413) axially aligned and in communication with the opening (32), and at least one air passage (414) communicated with the through hole (413) and permitting air externally of the flow guide component (41) to flow therethrough into the receiving space (311) via the through hole (413) and the opening (32); and a heat-radiating pipe (42) disposed to extend upwardly from the flow guide component (41) and disposed to surround the through hole (413) and permitting flow of flue gas resulting from combustion of the fuel material (200) in the receiving space (311) therethrough.

A cooker for use by troops on deployment comprises a container 10 for cooking fat sitting upon a heating chamber 12. The heating chamber 12 has a back wall 14 formed with an aperture 16 to receive a burner and a front wall 18 formed with an exhaust port 20 communicating with a chimney 22. The heating chamber has side walls extending between its front and back walls 18 and 14. The container has a hinged lid 28 which folds to present a rack 30 for food frying baskets (not shown). The cooker is configured and arranged so that flame from the burner does not contact the container 10 and heat is diffused over the container 10, whereby cooking fat therein is not locally overheated.

The present invention provides a reflection-type oil burner in which a temperature of an upper wall of a frame body can be kept low and radiation efficiency is improved. A combustion-cylinder structure 3 and a reflection plate 4 are provided in a frame body 1. A lower heat-shielding plate 5b is provided between the reflection plate 4 and the upper wall 1E in such a manner that the distance between the lower heat-shielding plate 5b and a partition wall 8 at a side of an opening portion 2 is longer than that at a side of reflection plate 4. Heat ray emitted from the combustion-cylinder structure 3 is reflected by an inclined lower heat-shielding plate 5b and radiates in a forward direction from the frame body 1 through the opening portion 2. Radiation heat radiated by the lower heat-shielding plate 5b, which is to be at high temperature, radiates through the opening portion 2 in a forward direction of the frame body 1. A combustion-gas collision member 6 for blocking a flow of combustion gas running out of the combustion-cylinder structure 3 is provided at the lower heat-shielding plated 5b. Cool air entering through an inlet 1b at a rear wall 1B of the frame body 1 is guided between the upper heat-shield plate 5a and the lower heat-shield plate 5b in a forward direction from the frame body 1. The combustion gas diffuses when flowing over the combustion-gas collision member 6 and lowers its temperature. The combustion gas runs out in a forward direction of the frame body 1 at the end of the lower heat-shielding plate 5b along air running out of the outlet 1a.