Rocket mass heaters.

[pips4bucks]

I heard about these things today.  They look pretty interesting.  Anyone ever seen one, used one, or know anything about them?

http://erica-k-wisner.hubpages.com/hub/Rocket-Mass-Heaters-Efficient-Home-Heating-With-Wood

[KFhunter]

yes, but no I've not used one.
 
Here is a mini one, well the principal anyways for a backpackers version.
 
http://www.gofastandlight.com/prodinfo.asp?number=CK-K5000X%20STEEL&variation=
 
there is another one I've seen before I'll see if I can dig up a link.

[KFhunter]

not the one I was after, but it'll charge your cell phone 
 
http://www.gadget.com/2011/07/12/biolite-stove-cooks-your-food-and-charges-your-cell-phone/

[lokidog]

That looks kind of cool.  I like the idea by one of the commentors about combining it with radiant floor heating.  I have a spot in my daylight basement that this might be perfect for.

[HUNTINCOUPLE]

I seen em on u-tube. Pretty neet set up. some take up alot of room!