I burn anything/everything with btu's. My home, way up in snow
country, is 2200 sq ft and it's heated with my woodburner. I do have
an LP furnace, but it never kicks on. The rule is to keep your bottom
air damper mostly open and burn everything hot, using a smaller fire.
Last spring I had 1.5 gallons of dry soot in my cleanout. My chimney is
one alongside my home, masonry block with a ceramic flue, but the
masonry block has 2" of foam insulation and siding over it.