Calculating a Stove's BTU/hour

[Karottop]

I've recently installed two wood stoves in my house. The upstairs stove is an Osburn 1600 insert and the basement stove is Buck Stove model 80.

The buck stove is gigantic - it barely fit in my fireplace and has a 2.6 cu/ft firebox
The Obsburn looks newer but only has a 1.8 cu/ft firebox

Whats odd is the EPA rating for the buck stove is ~40,000 BTUs per hour and the Osburn is 65,000 BTU's per hour. How does that little Osburn stove put out ~50% more heat than the Buck Stove?

To confuse the situation even more, the Buck Stove is rated to heat anywhere from 1800-2600 sq/ft, while the Osburn is rated for 1800 sq/ft? it apparently puts out more heat per hour but is rated for a smaller house? I'm a little confused - thanks for any help..

 

[begreen]

I think you may be mixing peak output with EPA tested output. They are not the same. The Buck 80 is EPA rated at 9200-40500 BTUs/hr and the Osburn 1600 is rated at 11,800 to 42,400 BTUs/hr. 65,000 BTUs is peak output which is more marketing than real world. They are also two different technologies - cat vs non-cat. The Buck's output will be more steady and sustained over a longer period of time than the brief peak output of the Osburn.

 

[Karottop]

I think you may be mixing peak output with EPA tested output. They are not the same. The Buck 80 is EPA rated at 9200-40500 BTUs/hr and the Osburn 1600 is rated at 11,800 to 42,400 BTUs/hr. 65,000 BTUs is peak output which is more marketing than real world. They are also two different technologies - cat vs non-cat. The Buck's output will be more steady and sustained over a longer period of time than the brief peak output of the Osburn.

Ah, ok I didn't realize there was a difference. That makes a lot more sense, thank you!