Wood pellets are made from compressed sawdust, usually waste produced in the wood processing industry (such as sawmills). They are cylindrical in shape, held together by lignin which is naturally occurring in wood. Pellets are uniform in size – around 6mm in diameter and 25mm in length. The pellets are very dry, with less than 10% moisture content.
Pellets can be purchased in bulk, or in individual bags from co-ops, hardware stores or fuel supply stores. Loose pellets are blown into a silo or hopper, or the supplier can deliver bagged pellets on a pallet. Woodco also supplies pellet storage solutions – i.e. hoppers and silos – for residential and commercial applications. It is important that the pellets are kept dry, to keep them intact. These solutions also allow the fuel to be automatically fed to the boiler, for a more hands-off experience.
The cost of wood pellets may vary, depending on the supplier. It is often significantly cheaper to buy the pellets in bulk. Shop around to find the best deal – but make sure that they are of an approved quality. Woodco’s pellet boilers require pellets of EN-Plus A1 standard, for optimum efficiency. Using approved fuel will ensure that your boiler works better, for longer. The pellets are very clean, producing only about 0.5% ash in combustion.
The calorific value of wood pellets is around 4.85kWh/kg. This means that one kilogram of pellets will provide 4.85 kilowatt hours of heat energy. By comparison, the calorific value of oil is around 10.18kWh/litre.