I agree that a barrel stove will throw off incredible amounts of heat. I am not sure of the longevityof the barrels though. I know that when I was growing up we used 55 gallon barrels as trash burning barrels and they tended to last about a year before being used up. Not sure if indoor wood burning would last substantially longer or not.
"You fight until you die. That's the whole deal in life. PERIOD." Regular Joe