Generally speaking, you'll get best results burning the highest density (heaviest) hardwood with the highest BTU (available heat) content that can be found in your area. Here are two charts, the first one organizing various species by BTU content ( 1 MBTU = one million btu), and the second organizing the same species alphabetically for easy lookup.
What the chart is saying is that some wood species given up more energy, thus heat, when they burn. NOTE: Double click on the above chart to get a larger more readable image.
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