With the advent of cold weather and before the start of the heating season, owners of pellet boilers are faced with a choice - which pellets to purchase. Since several tons are bought at one time, it is important to determine which product is being offered to you. Manufacturers, as a rule, offer to get a trial batch and melt the boiler. But it is not always possible to test. In this article, we tried to systematize all the information about this type of fuel, so that customers have the opportunity to determine the quality of pellets without burning. Production Raw materials for wood pellets are sawdust, wood chips, shavings of various types of wood, illiquid wooden products, etc. On the wood pellet press, multiple grinding and drying of the raw material takes place. This device using a shaft and rollers squeezes the feedstock through the cells of the mould at a temperature about 250-300 C. Under these conditions, wood releases lignin, which is a natural substance, promoting th