Abstract : This report describes an effort to develop conceptual designs for a new improved M41 type space heater. The design features of the current M41 were evaluated and ranked in order of importance. A literature search was performed to base possible design improvements using technology which was not available when the M41 was initally developed. Laboratory tests were performed on the M41 to develop a better understanding of the operation of the M41 heater. Finally, several design concepts were developed based on the results of the literature search and laboratory tests. It is concluded that a program to develop a new improved M41 heater, utilizing the results of the literature search and laboratory tests, has a high probability of success. Keywords: Stoves, Tents, Energy, Fuels, Temperature.