The Bear Brick website indicates each brick can produce 16,000 btu's. I'm troubled by the word "can" as opposed to "will." It might actually produce less.
http://www.bmfp.com/bear-bricks/bear-bricks.html
16,000 btu's is about the heat content of a very well-seasoned log (8-10% MC) which weighs just 2 pounds. I have 3-year, woodshed firewood, (very dry) and I grabbed a piece of aspen (popple), just about the lowest heat content per volume wood around, and a split of a 4" branch, 16" long, weighed 2 pounds. This means that 4" branch produced 2 splits, equivalent to 2 Bear Bricks.
24 Bear Bricks/day, assuming 16,000 actual btu's/brick, works out to 384,000 gross btu's, and assuming a 65% stove efficiency, 250,000 available btu's, which is 10,400 btu's/hour heat output.
If you use the Hearth.com heat loss calculator, a 10' x 10' x 8' single room (100 sq ft), one exterior wall (assumed standard room), has a heat loss of 5,050 btu's/hr. Based on this calculation, 24 Bear Bricks per day would heat about 200 sq ft of living space.
https://www.hearth.com/calc/roomcalc.html
Obviously, this is a very rough calculation, but it does start to give an idea as to how many Bear Bricks a person might need to heat a house. Do the heat loss calc, and that might explain why so many bricks are being burned.
Also be sure to compare cost with current cost of other fuels or electricity.