A Wooden pellets are only made of soft wood which must be without any impurities or ingredients. These clean wooden pellets are easy to burn. Burning of this fuel does not need any special boilers or burners. There are a lot of producers of these boilers all round the world, but the price of clean wooden pellets is very high and heating costs with these pellets are nearly the same as costs of gas heating.

B Plant pellets are made of parts of plant e.g. straw, hay and waste remaining from crop refining, mustard, poppy and other plants.
Burning of these plant fuels causes cakes that can stick to the fire grate of standard boiler or burner. These stuck cakes are very hard to remove and it must be removed manually.  Boilers PETROJET have different burning chambers that easily handle caking fuel. Big advantage of plant bio pellets is very low price of this fuel. There are a lot of producers of plant bio pellets. These plant pellets are obligatorily added to coal in heat power stations. It causes big number of plant bio pellets producers and the number is still rising. Producers are mainly farmers, who have easy access to bio plant waste. Disadvantage of these plant pellets is that only some boilers of some producers are able to burn this fuel. In case that some boiler is able to burn this fuel, it usually must be one or two kinds of plant fuel with strictly defined composition.