combustion
air
9
10
Reduced draft can occur when:
• The temperature difference is too small
between smoke gasses and outdoor
temperature, for eg. poorly insulated chimney
• To short of a chimney
• The outside temperature is high, and indoor
temperature is low for eg. in summer
• False air in the chimney
• Chimney is blocked
• Air tight house (lack of combustion air supply)
• Poorly placed chimney for the surroundings,
for ex. the ridge and trees may cause
turbulence
Good draft occurs when:
• The difference in temperature in the chimney
(warmer) and outside temperature (colder)
• It is clear weather
• The chimney has the right height min 4 meters
above the stove, and clear of the roof ridge.
1.10 Fuel
Your new stove is EN approved for firing with
wood fuel. You must therefore only burn clean,
dry wood in your stove. Never use your stove
to burn driftwood, as this may contain a lot of
salt which can damage both the stove and the
chimney. Similarly, you must not fire your stove
with refuse, painted wood, pressure-impregna-
ted wood or chipboard, as these materials can
emit poisonous fumes and smoke.
Correct firing using well seasoned wood pro-
vides optimal heat output and maximum effi-
ciency. At the same time, correct firing prevents
environmental damage in the form of smoke
emissions and reduces the risk of chimney fires.
If the wood is damp and inadequately seasoned,
a large proportion of the energy in the fuel will be
used to vaporize the water and this will all disap-
pear up the chimney. Thus, it is important to use
dry, well seasoned wood, for eg. wood with a
moisture content of less than 20 %. Achieve this
by storing the wood for 1–2 years before use.
Pieces of firewood with a diameter of more than
10 cm should be split before before storing. The
pieces of firewood should be of an appropriate
length (approx. 20 cm) so that they can lie
flat on the bed of embers.
If you store your wood outdoors, it is best to
cover it.
Examples of fuel values
for different woods and their typical densities
per cubic meter, specified for 100% wood with
a moisture content of 18%.
Wood kg/m
3
Wood kg/m
3
Beech 710 Willow 560
Oak 700 Alder 540
Ash 700 Scotch pine 520
Elm 690 Larch 520
Maple 660 Lime 510
Birch 620 Spruce 450
Mountain pine 600 Poplar 450
It is advised not to use oil-containing woods
like teak tree and mahogany, as this can cau-
se damage to the glass.
Heating value in wood
You have to use about 2.4 kg normal wood to
replace one litre of heating oil. All woods have
almost the same heating value per kg, which is
about 5.27 kW/hour for absolute dry wood.
Wood with a moistness of 18% has a efficiency
of about 4.18 kW / hour per kg, and one litre
heating oil contains about 10 kW / hour.
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