Sierra Nevada Bioenergy Eco Fuel Wood Fuel Pellets are made from pure, all-natural wood and are manufactured at the highest quality control levels, designating our wood fuel pellets as “premium” grade. Our fuel pellets produce a consistent, high BTU output and produce less than half of a percent of ash. This translates to a hotter, more efficient burn, which means less fuel pellets burned, fewer fuel pellets purchased, less space needed for storage, fewer trips to the fuel pellet hopper and less waste to clean up. Sierra Nevada Bioenergy Eco Fuel fuel pellets are extremely dense and are produced with a low humidity content (below 10%) which allows them to be burned with a very high combustion efficiency. Additionally, their regular geometry and small size allow automatic feeding with very fine calibration. They can be fed to a burner by auger feeding or by pneumatic conveying.