
15
Fuels
Their combustion residue will produce uncontrolled air
pollution but will also have an adverse impact on the
functionality and service life of the chimney and fireplace
insert. The consequences are a higher susceptibility to
failure and faster wear. This can lead to costly refurbishment
measures or even replacement of the appliance. All
warranties and the right to warranty claims are invalidated
by the use of non-approved fuels.
Wood pellets
Waste
Pallets
Wood chips
Fig. 12: Examples of unauthorised fuels
3.2
Permitted fuels
Logs and wood briquettes are approved for use with
fireplace inserts.
Logs:
(natural, air-dried, max. 20 %
moisture content)
Wood briquettes
(natural wood, in accordance
with ISO 17225-3)
Fig. 13: Examples of approved fuels
3.3
Logs
3.3.1
Recommended residual moisture level
As a manufacturer with over 20 years of experience with
fireplaces, tests carried out on the test bench and practical
experience have shown that a 15 % residual moisture level
is ideal for the efficiency of the system and its emissions.
The most important factor for clean and low-emission
combustion is the combustion chamber temperature. The
aim is to raise the combustion chamber temperature as
quickly as possible to over 500 °C. Only then is the carbon in
the wood converted into carbon dioxide rather than carbon
monoxide. a high combustion chamber temperature is also
necessary for the pyrolytic self-cleaning effect, which is
conducive to a clean and clear vitroceramic window.
Only dry wood burns with low emissions! Energy is used to
evaporate the water, which is then lost for heating. Wood
with a residual moisture level of 15 % has approximately
twice the calorific value of recently cut wood with a water
content of approx. 50 %. The higher water content and the
lower combustion temperature increase the formation of
soot and tar in the fireplace and especially in the chimney.
This results in environmental pollution, greater need for
cleaning and damage to the fireplace.
We recommend a residual moisture level of 15 % for
a cleaner environment and cleaner vitroceramic windows.
Wood with a residual moisture content of more
then 20 % is difficult to ignite and causes higher
emissions.
We prescribe a maximum residual moisture content
of 20 % for our fireplace inserts.
3.3.2
Heating behaviour of wood
Note that different types of wood burn differently:
Hardwoods are ideal as firewood. They burn slowly and
with a steady flame. The embers are long-lasting.
Coniferous wood is high in resin and burns quickly.
Coniferous wood tends to spark more during the
combustion cycle.
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