That is true, but the 2.4 cu-ft fire box is pretty big for 1350 sq-ft. If I had access to one for free, I’d certainly bring hooking it up to try.This not to say that the.OP can achieve the same result. Heating a drafty house with poor insulation will not yield the same result. Also add in how the warm air will travel through the house.
Note I heated my shop with this stove before I insulated the ceiling (it struggled), but now with R38 im sure I could turn it into a tropical climate.