Woodchips are made from waste and weak wood with the help of a chipper. They are roughly 3-8cm large.
A preferably uniform size and low moisture content are the requirements for an unproblematic use of woodchips in heating systems.
For example, woodchips with a moisture content of 50% have a heating value of approx. 2,2 kWh/kg, while woodchips with a moisture content of 10% already have a heating value of 4,5 kWh/kg.