There is a clear distinction to be made between various types of pellets viz.: bark pellets, mixed wood pellets and bio pellets. Pellets can be made of pure waste wood originating from the wood industry. The differences in calorific value among the various species of trees are small. The thermal level of 100% dry wood, comparing the various species of trees varies between the 5.1 kWh until 5.3 kWh. Pellets from soft wood types (which contain more resin/lignin) have less caloric value then hard wood types. Soft wood pellets may cause deposit on windows of stoves. As for Bio pellets they are made of pure wood waste and may not contain any additives.
The moisture level is more important than the type/species of wood being use. This is because during burning the water content in the wood waste is consuming a considerable amount of energy. Newly cut wood may contain a moisture content of approx 50% and during the drying process of the newly cut wood the moisture content level may decrease to levels between the 12 to 20%.
By creating high pressure (during the pelletizing processing) wood pellets may lose an additional 2 to 4% moisture content. Well processed - produced pellets contain only a moisture content that lies between 7 and 8% with a thermal value of approx. 5,1 kWh/kg.
In comparison the thermal value of firewood with moisture content of 15% (normally dried firewood) amounts ca. 4,1 kWh/kg.
Waterland produce quality product manufactured pellets of the best combinations mix of hard- and soft- wood waste types/species coming from local sawmills and furniture industry.