træpiller

Træpiller are compacted, cylindrical pellets made from wood residues such as sawdust and chips. They are designed for use as a heating fuel, offering higher energy density and lower moisture than raw firewood, and are commonly used in pellet stoves and boilers.

Production begins with collecting wood waste, grinding it into fine particles, and drying to a low moisture content. The material is then pressed through a pellet mill; lignin in the wood acts as a natural binder, so no additional glue is usually needed. After cooling, the pellets are screened and packaged.

Træpiller are used in residential heating, district heating, and some industrial applications, often fed automatically into stoves and boilers. They require dedicated appliances designed for pellets and can offer clean burning and convenient handling compared to cordwood.

Energy content depends on moisture and wood type, but commonly ranges around 4.6–5.2 kWh per kilogram. They typically have low ash content and a relatively uniform size distribution, which supports stable combustion and easy dosing.

Quality and safety are guided in Europe by ENplus certification and the EN 14961-2 standard for wood pellets, with quality classes such as A1 and A2 describing impurities and ash limits.

Environmental considerations hinge on the sustainability of the wood source; pellets from certified forests can reduce net greenhouse gas emissions versus fossil fuels. Proper storage in a dry, ventilated area is important to avoid moisture uptake and mold, and to minimize dust.