there is really no way to measure the BTU output of a wood or hand fired stove because of the variables involved so it's just marketing. I would say 200k BTU's from this unit is optimistic, bordering on impossible. LS; I used to drag race and everyone had 400+ horsepower. yea right! My 12 second '68 El Camino had about 400hp (based on time slips/mph) and it would pull the wheels on the shift into 2nd gear. The strip is the best, no excuses, and there are always guys that are faster and spent more money. My 454 turned 8,000 Rpm on the limiter, I purposely forgot but I think I spent $2000 on rods and pistons and machine work. I used to get beat by 1980's Toyota Tercel's imported from Puerto-Rico, the 4 cylinder high compression crap boxes would run 10's all day long.