A little-known fact about wood stoves is that most of the heat comes not from the firebox but the 1st few feet of the exhaust pipe. The greater length of pipe inside the tent, the more warmth you will get from the stove. However, putting a hole in the roof of a tent can sometimes cause a leak at the stove jack during the rainy season, so another option is to have the stove exhaust exit through the side of the tent. In this situation where the exhaust pipe is necessarily very short, a larger firebox is called for.