Wood pellets are a climate-neutral fuel derived from biomass. Ideally, pellets do not contain chemical binders and have a high energy density. Two kilograms of wood pellets are roughly equivalent to the efficiency of one litre of heating oil. The combustion of wood releases only as much carbon dioxide as the tree absorbed while growing. Pelletising makes the wood more practical for use in private and industrial incinerators; wood pellets are like a bulk material and have good flow properties. The material is also compacted and the pellets have a higher bulk weight than loose wood, which reduces transport volumes. Tietjen’s hammer mills optimally crush wood for the pellet mill.