What are four biofuels for heating?

Four biofuels commonly used for heating include wood pellets, biodiesel, biomass, and bioethanol. Wood pellets are compressed sawdust used in pellet stoves and boilers. Biodiesel is derived from vegetable oils or animal fats and can be used in heating oil systems. Biomass refers to organic materials like agricultural residues or dedicated energy crops, while bioethanol, produced from fermenting plant sugars, can also be blended with traditional fuels for heating purposes.