We used this in a 10x20 tent and it did fine. The Cub stove kept the 10x20 tent warm, although it may be a bit undersized for a 10x20 tent it kept us warm and toasty as long as we kept the stove stoked well. The temps were down into the upper 20s at night. We used to use a propane heater that would use a 20lb tank every other day so this is much more economical and is easy up and easy down. We run one 24 inch long section of 4 inch stove pipe one section of 5 inch and one section of 6 inch so the 4 stores inside the 5 and the 5 stores inside of the 6. The stove, stove pipe , wood and connections take up less room in the truck than the old propane heater and all of the propane tanks needed to run it every night for 2 weeks. ...................... Highly recommended