This heater you can use in your tent! I like to go camping when it is cold out, and this really heats up your tent in minutes. Uses a regular sized propane take you get from any store. Be sure to get the carry bag to keep it clean when not using it.
Coleman Procat PerfectTemp heater provides safe, flameless heating. Easy, matchless lighting with electronic ignition. This cordless heater can be used in a garage, shop, tent, or anywhere you need a little extra warmth. Perfect for keeping you cozy on those chilly camping mornings. This 3,000 BTU unit runs up to 7 hours on 1 lb. propane cylinder. The battery operated fan provides up to 20 hours of increased heat circulation. $99
Coleman's SportCat Heater is a great portable heater you can take on a camping trip, to a sports outing, or in your golf cart. Its 1500-BTU heater will run for up to 14 hours on a single 16.4-ounce can of propane.
Instead of burning wood for heat, some Europeans now build a compost pile over plastic water lines that extract heat from the decomposing plant material. Temperatures can get as high as 149 degrees. With a circulating pump as the only moving part, the compost heater lasts an average of 12 to 16 mos. – and occasionally up to 24 mos. – providing heat and up to 80 percent of the hot water for a 1,500 sq. ft. home.