International Fachagentur Nachwachsende Rohstoffe e. V.


Log gasification boilers

In buildings currently in use, especially in rural areas, log gasification boilers are highly popular. For consumers with their own wood supply and favourable access to firewood – such as farmers and foresters, business owners with quantities of waste wood left in its natural state, or those directly obtaining the wood and working it in some way – heat can be provided, rather laboriously but at a low price. Operators of log gasification boilers also need to have the necessary storage area, because what one really should do is to maintain (and keep protected from rain) a stock of firewood (logs) to cover at least 2–3 years' need, for drying the wood and for balancing out weather-related fluctuations in demand.
By now, log gasification boilers are closely behind pellet heaters in terms of efficiency and emission levels, thanks to huge progress in development in recent years. They are no longer comparable to the traditional boiler stoves for wood and coal, with their low levels of effectiveness and the nuisance caused to neighbours. There are modern log gasification boilers in the capacity range from 5 kW up to several 100 kW. The most modern firing and regulation technology provides efficient and clean combustion; the result is that many types of boilers already offer levels well below the stricter threshold values for emissions as required by the 2010 amendment to the Small Firing Installations Ordinance.