Don't really feel like arguing, but will correct the size: fireview is 2.3 cu ft, 15% larger than 2 cu ft. Efficiency is quite good. 8 hours is 2/3 of 12 hours. Stove is rated at a max of 54,000 BTUs normal hardwood. Oak, locust, ironwood may be more....so, don't feel with a fully loaded stove 40,000 BTU average over 8 hours is much off. That is about 8 pounds of wood per hour for 8 hours = 64 pounds, assuming 5000 usable BTUs per pound. Fully loaded my Fireview quite easily held that when burning Ironwood or hickory. I don't have oak or locust, but they are similar in weight, are also commonly available in the NE. I used a Fireview as my only heat source for many years. It was easy to reload after 10-12 hours, but in really cold weather I generally got about 8 hour burn times with Ironwood, hickory, slightly less with sugar maple and beech. Yes, my home was chilly during really cold weather (-20 to -30), but my home is over 3000 sq feet. The PH, to compare, heats it well, and it is 2.7 cu ft, 81% HHV efficient. The Fireview is capable of heating a well insulated 2200 sq foot home, if there is a fairly open set up...which is why I said "even" for a fireview.
I stand by my suggestion that the OP visit Woodstock and see how the stoves should be burning, and that he consider a locally built stove that will heat a 2200 sq ft home, and where he will get plenty of assistance if he has any issues or difficulties in heating with wood.
It matters not to me whether he gets a BK or a Woodstock, (or any other stove), but I do think both would work just fine for him. I also don't think the BK long burn times on low are terribly important for most people heating in the NE, although they are for some. Most would be burning their BKs at a rate that would require reloading in 12 hours during the colder months. Equivalent size Woodstocks burn as long. In the more moderate climate of the Pacific Northwest, where the BKs are built, the long burn times at low output are a great asset.
ADDENDUM: Just read Grisu's post. Maybe the OP could take a few of his splits with him when visiting Woodstock. They would gladly take a look at the wood, and rule out or establish any issues with the wood, thus settling that aspect of the issue.