We've had great success with our PE Summit heating a majority of three floors. It's a 1920s Colonial with a converted attic into master bed. Four bedrooms on the second floor. We're not using fans to move the air, it seems to do just fine without the extra help. One benefit is that we have lots of interior doors, so we can shut off rooms that are not in need of heat. First floor is obviously the warmest. Second floor stays moderate, good for the kids. Third floor can hover in the low 60s when the temps are in the 20s; high 50s when we're below zero. We're OK with those temps, so if you're looking for something warmer, you might need to look at supplemental heat on the upper floors. Regardless of the stove's capabilities, at least it's dumping in BTUs that would have to be made up with fossil fuels otherwise.