10
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
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
In Millions of BTU/ HR
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.
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.
CAUTION
