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3.2
Permissible types of fuel
only the following types of fuel are approved for use:
•
natural, air-dried split logs (residual moisture max. 20 %).
•
Compressed wood pieces
§ Compressed wood pieces according to
din en iso 17225-3.
the following fuel types are not permissible:
•
Chemically treated wood
•
painted or varnished wood
•
synthetically coated wood
•
damp wood (residual moisture higher than 20 %)
•
Chipboards
•
Wood of euro pallets
•
trimmings
•
bark waste
•
pellets
•
Coal
•
Coke
•
Household waste
•
plastics
•
Waste paper
•
old clothes
§ burning non-permissible types of fuel is punishable by law
in many countries e.g.:
•
in germany as a violation of the Federal immission
Control Act (bimschg).
•
in switzerland as a violation of the Clean Air Act (lrV).
3.3
Permissible igniters
the following igniters are permissible:
•
igniter cube
•
igniter pad
•
Wood wool igniter
•
igniter wood
other igniter types are not permitted.
never use:
•
Flammable fluids and fire accelerants (e.g. ethyl alcohol or
kerosene) – there is a risk of deflagration!
•
paper – burns fast and results in flying ash!
3.4
Fuel storage
storage outside of buildings:
•
if possible, store the fuel on the sunny side of a building.
•
ensure that the storage location is ventilated and protected
against precipitation.
•
stack logs loosely along a wall and support them on at
least one side.
•
ensure that there is a gap between logs so that the air
flowing through them can carry off the moisture escaping
from the wood surface.
storage in buildings:
•
in a dry and well-ventilated room.
storage of freshly cut (green) wood in film or in closed rooms
without sufficient air exchange prevents drying and causes the
wood to become mouldy.
storage period:
•
At least one year for soft wood (e.g. coniferous wood,
poplar).
•
At least two years for hard wood (e.g. beech, oak).
5 We recommend a drying period of 2 – 3 years.
3.5
Size of the fuel pieces
•
small logs (width / height approx. 60 mm) for fast burning
and briefly high output.
•
large logs (width / height approx. 100 mm) for slow, even
burning.
ideal log size:
•
length ideally approx. 180 mm.
•
maximum length 330 mm.
•
Width / height approx. 80 mm.
Assembly and operating manual | Premium & Lean | 06.2023 | en
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