I have been researching the difference between propane and butane for use in a confined space such as a shelter. What Is the Difference Between Propane and Butane? | eHow.com As you can learn from the article, butane is not classified as a toxic gas, thus can be stored indoors. It burns very cleanly and as suggested, is used by chefs, catering services and for indoor cooking. I use a small one burner butane stove just for that reason. The stove is designed to only connect the small tank when ready to use for cooking, thus eliminating another leak source from additional hoses or fittings. It is of course utmost to have a good powered air source, be it electric or hand-powered, to circulate and exhaust the air in a shelter due to the stove using some of the available O2 in the air for ignition. I plan on adding a small exhaust in-line fan identical to the one used in the intake side of the system, this will have a vent above the stove and one in the bathroom, for obvious odoriferous reasons. The MRE meals that are stored in the shelter do have their own heat pacs, but do require additional water to work. The stove thus, should help in the conservation of water.