I have a couple of the colemans Joel suggested, they're no good inside a tent as they still emit gasses (they run on propane gas) and they stink like hell, but that maybe from them being new. There not bad otherwise & do take the chill out of the area around them outside. Another negative is they are bulky.
If I'm camping somewhere cold I take my rated sleeping bag & doona. Apparently it's best to sleep with as little clothing on as possible in the bag as you want the thermal benefits of it's design rather than insulate yourself from them.
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