I will definitely agree you should leave the maple and pick the Elm! When I first fired my boiler this fall I was burning soft maple..... Faster than I could cut it! Then I found some Red Elm and wow what a difference. I went from 6-8 hr burn times up to 10-12 hr. The only thing I have noticed is that American (white) Elm has a very pungent smell when burning. My father in law calls it "Piss" Elm!