My brother uses this one and I know it would heat the heck out of his house in central PA. It has moved to NW Illinois and is heating a much bigger farmhouse successfully, so I know it cranks. Now, when you say 14" logs, are you talking about unsplit diameter? You aren't throwing in whole logs are you? How do you get those burning without splitting them? I never had any luck unless we are talking a small log or large branch.