2.4 Wood types and calorific value
A wood’s efficiency does not depend only on its type, but also on its humidity, as well as the temperature of
the combustion chamber.
For more efficient and longer burning, without emission of hazardous substances, woods must be dry. Ide-
ally, their humidity percentage must not exceed 10% to 15%.
If this percentage is over 20%, the wood is not burned properly, whereas if the piece of wood has been cut
recently, the humidity is over 60% making it unsuitable for burning. The reason for that is that the fire will
be weak and pale and will produce dense smoke, unburned tar and creosote, soiling the ceramic glass and
the smoke duct.
It is preferable to get your wood supplies during the summer months and store them, to ensure better
combustion quality during the winter.
Useful tips
1. Always choose dry firewood
2. Avoid wood that pops (chestnut, conifers such as cedar, spruce and pine), as they may damage your
fireplace or the smoke duct
3. Pay attention to the size of the woods. Good firewood must have been cut at least twice
4. You should prefer oak, beech, olive wood, hard wood with high density since they will burn for longer
Briquettes
They ignite very easy, and burn slowly. They are economically advantageous because you will burn smaller
quantities compared to common firewood and they are easily stored. Also, you have less quantity of ashes
vs. to wood.
Birch
Soft wood ignites easily with great thermal energy production. It produces less smoke and ash compared to
other wood and burns silently. The same characteristics apply for lime and chestnut.
Beech
Hard wood ideal for firewood requires a high temperature to ignite. It weights a lot; it is dense and burns with
a calm and long fire for a longer time. Best when well seasoned. The same applies for oak, but seasoned
for 2-3 years.
The various wood types have various calorific values
The values are based on 15% residual wood moisture
3. APPROVALS AND CERTIFICATIONS
3.1 Approval
Your ARTE
®
wood stove has been tested under the following standards: EN13240
3.2 CE conformity
The manufacturer, G. Karnoutsos & CO, confirms that the ARTE
®
wood stove conforms to the standards
under EN 13240 and that the quality requirements are constantly monitored.
3.3 Ratings plate
The ratings sing is located on the bottom left hand side at the back of the stove.
An ARTE
®
Wood Stove can be fired with all of the above wood types
0% humidity
10% humidity
30% humidity
50% humidity
100% thermal efficiency
88% thermal efficiency
63% thermal efficiency
39% thermal efficiency
Wood Type Thermal Capacity (Kcal/h-1Kg)
Briquette 5.000
Birch 4.800
Walnut 4.731
Oak 4.619
Beech 4.578
Fir 4.588
Common Oak 4.548
Pine 4.457
Olive wood 4.100
Poplar 4.022
860Kcal/h = 1Kw/h
32 | 33
APOLLO WOOD STOVE
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