I have a 16X20 Wall Tent that we used a square wood stove to heat for several years. Then three years ago, we decided to try two Large Mr. Buddy's. The ones made for tents. We left the vents open in the tent to prevent moisture and were shocked at how warm those heaters kept us. We turned them down low at night just to be able to sleep and we don't have to get up throughout the night to stoke the fire. Turn them on high in the morning and in five minutes the tent was again very comfortable. You may want to consider bringing a propane heater as a back-up to see how it works in your size tent. BTW, I showed this method to an outfitter in Colorado and they now use them for back-up heat for their tent hunters.
