Yeah, for 1 block, you're right, you can go forever. But, if you're only doing this for 1 block, then, quite frankly, don't bother. 1 block in the whole world isn't going to make a difference. I would assume you'd want to develop a system that others could follow, no? If so, then this is a terrible idea, because it is not sustainable large-scale. Not to mention all the carbon monoxide you'll be pumping into the air.
I commend you for trying to do this, but burning wood is not the way to go. We have the technology; use it.