Let's see - I start my stove about Sept 20 and run it through May 20. My house is always comfortable, no openeing windows and crap like that because it is too hot as the heat exchanger is in our ductwork and we just use the air handler part of the furnace, all thermostatically controlled, no muss or fuss. No hot or cold spots. One stove to feed and no mess in the house. Includes my hot water and the heating of the water for the hottub. My wife likes 74 degrees not 68. Heats my attached garage to a nice toasty 70 degrees because that is where our laundry room is. We really like getting into a nice warm car when it is crappy outside. The double garage door gets opened at least 2 times a day and we lose just about all the heat in the garage so it needs to be reheated. I really like washing my cars in a nice warm garage. And in that 6 cord figure it does not even include the savings that I get from the hot water and the heating of the water for our hot tub. Not only can you not physically do all these things with 2 free standing stoves, but even if you could ain't no way you can do all of that with 2 cords. My father in law heated with a fireplace insert and another free standing stove for years. I used to help him cut and stack the wood. He did a lot less with his stoves than I do and he used almost 5 cords, plus he had to open windows at times, let the stoves go out when it was warm, restart them and all that hassle. So I do all that I mentioned for about 6 cord, even if I bought the wood that is about $725 as wood goes for about $125 a cord in my neck of the woods. I will stand by my statement that OWB's can be pretty darn efficient.