Our external combustion biomass boiler can burn waste wood (sawdust and chips) with a moisture content between 20% and 40%, and a particle size as large as 1.5 inches. The automated feeder routes wood chips or other solid fuel from the hopper to its built-in gasifier. The airflow is also adjustable via automated shutters, based on the supply needs. The gasifier generates higher temperatures and lower emissions, giving its users a significant advantage.