No combustion takes place without any emissions. However, the combustion in pellet boilers is CO2-neutral, because only as much carbon dioxide is released as the tree absorbed previously during its growth and would release in the natural rotting process. CO2 emissions are therefore very low. In addition, pellet boilers already comply with the limits for fine dust stipulated in the stricter Federal Emission Control Act (BImSchV) which apply from 2020. Combustion monitoring, automatic fuel feed and air regulation – in conjunction with the standardised dry fuel made of natural wood without additives – mean that pellet heating systems can already meet these strict criteria today, without any filters.