I'd go for a radiant heater like the HEATSTAR portable propane heater or a comparable unit. You're going to be trying to heat around 500 sf (I'm assuming your roof isn't flat or else you'd be heating 360 sf). The heater you proposed is less than a foot by a foot and a half and because it burns logs or coal, that's one medium size log burning at a time, if you're lucky. And how often are you going to have to throw on another log? Your tent must have an outlet for a smoke stack as well (I'm sure it does if you're looking at this type of a heater). Sure, this might do the job to keep you from freezing as long as you hover over it, but you aren't going to be wearing shorts in your tent. If you get an attachment for a large propane tank, you can easily heat 500 sf and have up to 52 hours of burn time and if it gets too warm, you can always turn it down. Also, no clean up with the propane tank. The downside with the propane heater is ventilation, but if you have a slot for a smoke stack that shouldn't be a problem. That's something you'll have to keep in mind. I'm all about making things easy and the ebay wood stove looks like more hassle than it's worth to try to heat a large tent. Larger wood stove would be great, you'll never run out of fuel, but all depends on how much you're willing to spend and how far you have to drag it.