HM,
I don't have a year of burning with my BKK yet, but I'll offer some info for your data collection if it's of any benefit. I also have two friends with the same stove which are also new BKK owners and I can include some of their info as well (Friend A and B).
1) My house is about 3000 sq ft total, but recently I've only been heating about 850 sq ft (first floor) to 1700 sg ft (insulated basement and 1st floor) of the house. The first floor ceilings are only half insulated with R15, so there's some heat loss to the 2nd and 3rd floor (the upper floors stay in the 40's and 50's throughout the winter, in low single digit temps they drop as low as 39°).
Friend A has about 2000 sq ft with the heated basement and upper floor. His basement (stove location) is only about 1/2 insulated at this point.
Friend B lives a small house, I'd guess he has about 750 sq ft (not a typo). Yes, he insisted on the larger BK because he wants to try loading only once a day for much of the season. He gets the most stove/sq ft award!
2) All three of us are in CT. I'm direct coastal, the other two are more central.
3) I'd say all three have average insulation. My windows are low-e, argon filled, double pane. Don't know about the others.
4) Average temp in my house is probably low 70s on the first floor. Friend A is probably high 60's and friend B likes it warm (he'll have no problem achieving this! :cheese
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5) Unknown with the BKKs. I'm guessing under 3 cords to heat the basement and 1st floor of my house (if I don't use the pellet stove or my high efficiency mini splits, which I will during the shoulder seasons). Friend A will likely come in a little over 3 cords and B will certainly be under 3 cords.
6) I have plumbed in a 4" OAK, which I will use unless I have problems associated with it (unlikely). The other 2 I believe aren't using OAK.
7) Only experimental burns, but 24 hrs plus at low burn (oak). Friend B is already heating and has gone 12 hrs or so with only 5 splits "a hair larger than a 4x4 in diameter", but he hasn't fully loaded the fire box yet.
8) Unknown.
9) All of us have nothing but praise so far. Loving the fact that this stove can be turned WAY down. The burn is fairly consistent throughout. Obviously burn time is a huge plus. The only major complaint all of us have is the 8" flue requirement. The looks are a little subjective, but we all bought the parlor model and all think it's a decent looking stove in this configuration.
10) Selkirk, Simpson, Selkirk. All double wall and/or class A.
11) Mine is a little over 35', but 6". A is about 20', and B I think is at 16', both 8".
12) It looks like all of our stoves will be run at the low to medium settings. I can't see needing more than this, plus I think this stove is most efficient at it's lower range.
If I had to guess, and again it's a guess, I'd say you'd use about 1/4 to a 1/3 less wood with the BK over the 30.
I know a lot of this isn't good solid historical data, but hopefully it might help you to see what we are doing.