That's exactly what I look like, except my helmet is made of tinfoil!
Jk'ing. I don't think anyone isn't getting along Im genuinely very curious about these stoves. I am strongly considering putting one in my shop, but I am concerned somewhat over the high output ability. I get that they can go slow and low for days even and that they are very efficient. I've had my hands on a few now, well built quality stoves for certain.
I'm just not seeing how a 3-7% efficiency edge done in a lab is equaling all the wood savings I hear about. Also assuming if the king only lists high output of 57,000btu(or whatever it is) that if that is the lower efficiency number than what is the efficiency look like if the stove is being pushed harder? Does it drop off more?
I've done my own calculations (right, wrong or otherwise) to try and figure out what the King is capable of and even then I cannot tell what the peak output in any one single hour is. Further more, I'm not 100% sure if that is what Summit is communicating when they said their stove put out 99K BTU/HR either. I just haven't read about how they quantify that value and some manufactures will not tell you. In that regards, hats off to BK for going the extra mile to help us understand the stoves performance.
In the past I have read the HHV and LHV test procedures to help myself better understand what the efficiency percentages mean to me. At this point in time I don't recall much from that reading. Additionally, it doesn't help to compare stoves if one manufacture used a different method. The point in this thread was also to see if there was a better way to compare different stoves.
Regardless, you want to do a play on numbers then BK gives you lots of good stuff. You could estimate how many btu/hr the stove puts out but there are a few assumptions.
First, the stove specs are: 703,390 available BTU's from a max load, 82% efficiency (HHV), and average output of 48,065 btu/hr for 12 hours.
(703,390 btu x 0.82)/12hr = 48,065 btu/hr averave in a 12 hour cycle.
IF you use the same specs and assume you can burn all of the fuel in 8 hours then it becomes (703,390 btu x 0.82)/8hr = 72,097 btu/hr for 8 hrs.
I know there will be coals in the firebox after 8 hours on high so it might not be fair to assume the stove burnt all of the fuel after 8 hours so there would still be a deduction in performance of btu/hr but it might be minor.
IF you use the same specs but the LHV efficiency of 88% then it becomes (703,390 btu x 0.88)/12hr = 51,582 btu/hr average over 12 hours.
Assume you can burn it in 8 hours: (703,390 btu x 0.88)/8 hr = 77,373 btu/hr average in 8 hours.
As you can see, still not comparable to a stove of relative size that claims "99,000 btu/hr" output. There's a lot to be desired from the manufactures that make a claim like that. It's not very informative if its just a peak number but it is helpful to know if you will have enough horsepower. I'm not sure there is any method to compare performance unless each stove is tested in the same manner. Even then without knowing exactly how many BTU's per hour you need minimum how do you know what size stove you nee? Just buy big I guess.