I burn mostly oak, but I have a small supply of black locust that has been c/s/s for 18 months. With heavy winds and cold temps moving in over the next day or two, I decided to burn a bit of it. Man it puts out the heat! With 3 pieces the house of up to 75! Temperature outside was in the 20s and wind chill was in single digits! I wish I had more of this stuff around!