Since no one has mentioned it, let me throw this bad boy into the ring:
Its an alcohol heater, popular with boaters. Why? Because propane can always go boom, and going boom on a boat is a bad, bad thing. It also doesn't put water into the air like burning propane does, and will work at very low temps, which propane does not. It negates the need for a propane tank and even a stove, cause you can cook with an Orgio too. Sure, you only have a single burner, but you can buy or make a small trangia or fancy feast cat can alcohol stove and use that as your second burner. Then you have a stove for backpacking too.
Disadvantages: These are pricey, and you need to find denatured alcohol which is not quite as cheap as propane. Most hardware stores carry it, and you can buy it in bulk (five gallons) from Sears or Home Depot. One person I know, a boater with a severe aversion to propane and also has a FWC has a five gallon jerry can filled with alcohol on the back of his camper. That lasts him months to a year of fairly heavy use he reports. Freezing point of denatured alcohol is -173 degrees farenheit, colder than the coldest temperature ever recorded on planet earth, so no worries there.
Here is a guy in Alaska who has an older model of heat pal he found on ebay, and I would kill, ie, commit murder, ie take a life just to get his two burner alcohol camping stove. They are both 60's vintage, and have fierce intergrity.
