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12-GB
Instruction manual - GB
GB
5. Fuel
The specified fuel are good quality pellets of 6 - 8 mm diameter, 5 - 25 mm length and 16 - 19
MJ.kg
-1
caloric power. As alternative fuel (in case of urgent need) use dry firewood of 80 – 150 mm
diameter, minimum 2 years old with 12 – 20% moisture content, 300 – 700mm length - depend on
boiler type and 16 - 19 MJ.kg
-1
caloric power. Good quality pellets are such that do not disintegrate
into sawdust and are made from soft barkless wood without other additive (so called white pellets).
Basic wood burning data
You can ensure maximum output and a long service life if you burn wood which has been left for
at least 2 years to dry. The following graph illustrates the relationship of moisture content to heating
capacity of the fuel. The energy content declines dramatically with increased water contents.
Example:
Wood with 20% moisture contents has thermal power of 4 kWh /1 kg of wood.
Wood with 60% moisture contents has thermal power of 1.5 kWh /1 kg of wood.
•
e.g. – spruce wood which has been stored
for 1 year under shelter – see graph
Boilers are not suitable for burning wood with moisture content lower than 12%.
High-quality wooden pellets – white without
black dots (bark)
Poor-quality wooden pellets – dark with bark
(with black dots)
