Heating a house....

I helped a friend put in one of the outdoor furnaces (wood burning), it works like a champ. He stokes it twice a day, it feeds hot water into a small heat exchanger and you use your regular circulator pumps. His house is always warm but you do have to have access to a lot of wood...not a problem here in New Jersey since the storm! The total cost was around $11,000 for the conversion.