Logging On!
/It turns out that thousands of years of chopping wood was a waste of time. The amazing Spruce Stove burns an entire tree, a little bit at a time, to keep your home warm. It’s brilliant design allows you to slide a tree slowly into the stove cylinder and close a circular door around the log keeping the flames in and the burning controlled. As as each section of the log burns, you push a little more in the fire.
You'd need a BIG house and a few burly guys for this log fire. I'll stick to my gas central heating.