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Note: The Heat value of wood depends a lot on the The values below are based on ovendry (12% moisture) wood. Air-seasoned wood (20% moisture content) will have about 7% lower BTUs. e.g. 28 vs 30.

HHV - Higher Heating Value (Million Btu/Cord)

Maple
Bigleaf 20.6
Black 24.5
Red 23.2
Silver 20.2
Sugar 27.0
Oak Red
Genl. at UNL 24.6
Black 26.2
Cherybark 29.2
Laurel 27.0
Northern red 27.0
Pin 27.0
Scarlet 28.8
Southern red 25.3
Water 27.0
Willow 29.6
Oak, White
Genl. at UNL 29.1
Bur 27.5
Chestnut 28.3
Live 37.8
Overcup 27.0
Post 28.8
Swamp chestnut 28.8
Swamp white 30.9
White 29.2
Oak Other
Black 22.6
Blue 38.2
Coast Live 28.5
Canyon Live 31.7
Tanoak 26.1
Bur 26.2
Source: Most came from "Energy engineering fundamentals with residential and commercial applications" by Charles B Schuder
It is based on date in the "Wood Handbook: Wood as an Engineering Material, (1974)", Forest Products Laboratory, USDA.
Some from sepulveda.com/firewood.htm
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last updated 18 Dec 2004