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Heating value Information on fuel
9.7 Heating value
Heating values of fuels
Heating
value based
on weight
Cubic metre (rm)
a
Loose cubic metre (srm)
b
Round logs Logs Wood chips P16S Wood chips P31S
Weight
Heating
value
Weight
Heating
value
Weight
Heating
value
Water
content
15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30%
Unit
kWh/
kg
kWh/
kg
kg/
rm
kg/
rm
kWh/
rm
kWh/
rm
kg/
srm
kg/
srm
kWh/
srm
kWh/
srm
kg/
srm
kg/
srm
kWh/
srm
kWh/
srm
Softwood
1 rm =
0.65 fm
c
1rm =
0.56 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Fir 4.40 3.51 1270 1170 1100 1010 178 208 780 720 148 171 650 600
Spruce 4.49 3.58 1380 1260 1190 1090 189 218 850 780 157 181 710 650
Douglas fir 4.43 3.53 1480 1360 1280 1170 206 237 910 840 172 198 760 700
Pine 4.32 3.44 1630 1490 1400 1290 232 267 1000 920 193 223 830 770
Larch 4.27 3.39 1660 1520 1430 1310 239 275 1020 930 199 229 850 780
Hardwood
1 rm =
0.59 fm
c
1rm =
0.50 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Poplar 3.99 3.16 1020 930 870 790 174 200 690 630 145 167 580 530
Willow 3.76 2.97 1200 1100 1020 930 217 250 810 740 181 208 680 620
Alder 4.06 3.23 1270 1160 1080 990 212 245 860 790 177 204 720 660
Maple 4.04 3.21 1550 1420 1310 1200 260 300 1050 960 217 250 880 800
Birch 4.01 3.18 1570 1430 1330 1210 265 305 1060 970 221 254 890 810
Ash 4.10 3.25 1760 1610 1490 1390 291 335 1190 1090 242 279 990 910
Beech 4.13 3.28 1800 1640 1520 1390 295 340 1220 1110 246 283 1020 930
Hornbeam 4.06 3.23 1920 1760 1630 1490 321 369 1300 1190 267 308 1090 990
Black locust 4.11 3.27 1920 1760 1630 1490 317 365 1300 1190 264 304 1090 990
a. A cubic metre (rm) corresponds to 1 m³ layered round logs/logs (1 m length) with air gaps.
b. A loose cubic metre (srm) corresponds to 1 m³ of loosely dumped wood chips.
c. A solid cubic metre (fm) corresponds to 1 m³ wood without air gaps.
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