25
25
Fuel
The stove has been tested in accordance with EN 13229:2001, EN 13229:2001/
A1:2003, EN 13229:2001/A2:2004, and NS 3058 for stoking split, dried birchwood,
and is
approved for broad-leaved/coniferous tree wood. The firewood must have a water con-
tent of 15-20% and its max. length should be 30 cm.
Stoking with wet firewood causes both soot, environmental pollution and bad fuel
economy. Freshly cut wood contains approx. 60-70% water and is thoroughly unsuit-
able for stoking. Count min. 1-2 years of storage time for newly cut wood before
using.
Wood with a diameter of more than 100 mm should be split. Regardless of wood size,
it should always have at least one surface area free of bark.
We do not recommend stoking with painted, laminated or impregnated wood,
wood with a synthetic surface, painted refuse wood, chipboard, plywood,
domestic waste, paper briquettes and pit coal, as this will produce malodorous
smoke, which could be poisonous.
When firing with the above-mentioned items and amounts larger than those recom-
mended, the stove is subjected to a larger amount of heat, which results in a higher
chimney temperature and lower efficiency. This can result in the stove and chimney
becoming damaged and would void the warranty.
The calorific value of the firewood is closely connected to the moisture level of the
firewood. Moist firewood has a low heat value. The more water the wood contains, the
more energy it takes for this water to vaporise, resulting in this energy being lost.
ONLY USE RECOMMENDED FUELS
The following table shows the calorific value of different types of wood, which have
been stored for 2 years, and which have a residual moisture of 15-17%.
Wood
Kg dry wood pr. m
3
compared to beech/oak
Hornbeam 640
110%
Beech and oak
580
100%
Ash 570
98%
Maple 540
93%
Birch 510
88%
Mountain pine
480
83%
Fir 390 67%
Poplar 380
65%
1 kg of wood yields the same heat energy irrespective of wood type.
1 kg beech merely takes up less space than 1 kg of fir.
Operating instructions
Please note that HETAS Ltd Appliance Approval only covers the use of
dry seasoned wood logs on this appliance. HETAS Ltd Approval does not
cover the use of other fuels either alone or mixed with the wood logs,
nor does it cover instructions for the use of other fuels.
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