QHT Boiler The Heat Value of Wood, Available Heat Per Cord In Millions of BTU/ HR, Wood Storage

The Heat Value of Wood

The following chart compiled by the United States Forest Products Laboratory indicates the amount of heat available per cord of wood from a few representative tree species. Other good to very good species would include apple, walnut, pecan, dogwood, cypress, sycamore and gum. The latter two are hard to split, as is elm.

Available Heat Per Cord

In Millions of BTU/ HR

Species	Green Wood	Air-Dry	Percent More Heat For Air-Dry Wood
Ash	16.5	20.0	21
Aspen (Popple, Poplar)	10.3	12.5	25
Beech, American	17.3	21.8	26
Birch, Yellow	17.3	21.3	23
Douglas Fir, Heartwood	13.0	18.0	38
Elm. American	14.3	17.2	20
Hickory, Shagbark	20.7	24.8	19
Maple, Red	15.0	18.8	24
Maple, Sugar	18.4	21.3	16
Oak, Red	17.9	21.3	19
Oak, White	19.2	22.7	18
Pine, Easter White	13.1	13.3	10
Pine, Southern yellow	14.2	20.5	44

WOOD STORAGE

Store your wood outside of the minimum clearances recommended on the drawings on page 19. Generally wood should be stored in the basement or barn, garage where insects wont bother the house. If fans are installed within fuel storage area, they should not create negative pressure in the room where the 3WOOD is located.

CAUTION

ASH REMOVAL

Before refueling the boiler, check the ash pan under grates and remove and dump ashes if full into a metal container. Replace the ash pan and close the ash door. After re-fueling, take the ash container and leave it outside the house.

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