Another thing that could be done to help store the heat energy is to place a rock slab or large rocks on top of the stove. The material will slowly absorb the heat and give it off after the fire is out and the metal has cooled.
You could also use the stove for the burn chamber of a rocket stove I wish I had some pictures of the one my father-in-law did at his cabin. Just to make it easier to find for future reference here is the build he did with fire bricks in his house.
Rocket Stove | Northern Kentucky Landscaping from The Good Earth, Inc.
This whole couch heats the house and it nice to warm up on when its cold out.