The firewood logs
Using traditional and ancestral heating is still the heating mode the most common wood volume. It is one that is less expensive but also represents the constraints for the user.
It is usually marketed in stere (stack 1m on 1m on 1m of
logs) or strings (2 cubic meters but varies Regions!). Their length depends on the provider and your requests according to your stove or boiler. Usually the choice is 1m, 50 and 33 cm cm. Small logs are usually sold (slightly) more expensive because they require more work for the lumberjack but it is a miscalculation because there are more empty spaces on a cubic meter of small logs.
The best wood heaters are hardwood (hornbeam, oak, beech ...) and softwood (pine, spruce, larch ...) can also be used. But their combustion is faster and they usually retain less well outside.
For good combustion, it must obviously use dry wood. This requires after cutting at least 2 years drying or even more for some species. Obviously the wood must be unpolluted (paint, varnish ...).
Pollution of the combustion heating logs
If CO2 balance sheet is almost zero, basking in the logs is not entirely harmless to the environment. Wood combustion liberates essentially soot and CO as well as other chemical compounds in lower amount. To limit these emissions, burning of quality wood in a properly maintained and of good quality is essential.
Finally, the quantity of ash generated by the combustion of logs can be significant, especially when the proportion of bark is high.
Price and energy equivalent logs
The price of a cubic meter varied between 2009 25 and 80 € € depending on the size, type of wood and whether it was or not dried. These prices vary widely across regions and quantities.
On the energy level, 1 stereotype "ideal" (30% of vacuum in the stack, beech or oak essence, dry) provides useful energy (ie taking into account the performance of your stove 70% about ) 1400 to 1500 kWh. This corresponds to about 160L of oil with a modern 90% efficiency boiler.
Given the variations and disparity of prices, it is difficult to make an objective comparison but taking a price of fuel oil 0.50 € / L, log wood remains about 50% cheaper than oil ... provided you buy well his wood . Indeed; if the quality of the fuel oil is extremely constant, the wood is the opposite! The fuel oil also represents a comfort of use that log heating can never reach. To learn more, the reader will read carefully the introduction of this file "heating with wood": why choose firewood.
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