We burn with an old inefficient Riteway. In fact I call her Black Betty. She is big, black and always hungry! She takes 24 inch pieces of firewood and I can load her good with about 10-12 good size pieces at a time. She heats the whole house since she is tied in with the duct work and a blower unit that kicks on once she gets to a certain temp.
timber--i have one of these also--and i burn very little wood---dont fill the stove with wood---except when go to bed at night--its far more efficient by not filling it--just enough to keep a bed of coals on the bottom--and i or two small pieces--i finally figured this out after owning it for 30 + years!!!!! believe 35 this year--and can still get parts for it---