Pellets are one type of natural solid biofuel and they are 100% natural product. They respond to the increasing demand for clean and cheap energy. Pellets come in the form of small cylinders, with 25mm length and a diameter of 5-8 mm. They are produced by compressed sawdust, forest residues and wood. Pellets are formed by machining, without the use of chemicals or other substances. Moreover, pellets are used across the world for heating in stoves, fireplaces and boilers, with high-tech devices, allowing autonomy, adjustable temperature control and combustion.