Firewood Osage Orange has a heating value of 30.1 million BTU's per cord. Comments: Excellent heating value, difficult to split, difficult to start, heavy smoke, very good coaling quality Black Locust has a heating value of 29.3 million BTU's per cord. Comments: Moderate to split, few sparks, slight fragrance, difficult to start, light smoke, excellent coaling qualities White Oak has a heating value of 26.4 million BTU's per cord. Comments: Easy to split, few sparks, slight fragrance, moderate to start, light smoke, excellent coaling quality Red Oak has a heating value of 24.8 million BTU's per cord. Comments: Easy to split, few sparks, slight fragrance, moderate to start, light smoke, good coaling quality Hackberry has a heating value of 20.5 million BTU's per cord. Comments: Easy to split, good coaling qualities