Wood like birch, beech, oak, ash, elm, pine wood and wood from fruit trees is
all suitable for splitting into firewood.
Waste products like pressure-treated wood, chipboard, coloured brochure or
glossy paper must not be used in a wood-burning stove. They develop
hydrochloric acid or heavy metals which cause a lot of damage to the stove
and the environment.
Firewood should have a diameter of 7-9 cm and be no more than about 30
cm long, otherwise it will get too close to the side of the stove (at the DS-
testing firewood at a length of 28 cm was used). The most important thing for
good combustion is that the wood is dry (15-20% moisture). If the firewood is
too wet it is difficult to get it to burn, the chimney draught is nonexistent,
there is a lot of smoke and the exploitation is lower as the water has to
evaporate first. Furthermore there may be damage to the stove and the
chimney in the shape of shining soot and tarry deposits. At worst it can cause
a chimney fire. If the firewood is too dry it will burn too quickly. Often the
gasses in the wood are released faster than they can burn and some go
unburned through the chimney. This also gives lower exploitation and harms
the environment.
So it is a balance that is quite easy to find with a little practise. See also below
under Storage.
Bio-briquettes can be used, but they develop a lot of ash and dust.
Put in max. 2 kg per hour.
Energy coke must not be used as it contains a lot of sulphur which wears on a
stove, the chimney and the environment. The life of stove and chimney will be
significantly reduced by using this firing type and the right to claim
compensation for the product is void.
Storage of the firewood is best under a roof, however with good ventilation,
e.g. in a carport or under a shed roof. Place the wood on a wooden pallet or
the like so it is free from the ground. Fresh wood that has been sawed and
split must be stored for about 1-2 years this way until the moisture in the
wood is down to 15-20%.
The ashes can be put in the rubbish bin for garbage collection. The ashes
should always have cooled for 1-2 days before it is put in the rubbish bin, as
there might still be embers that can light garbage or a garbage bag.
Regulation and smoke damper:
If one is fixed in the chimney it should not close of more than 80% of the
internal diameter of the chimney.
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General