Add to ORKGThe aim of the bachelor thesis is to discuss about boilers for solid fuel which small output (up to 500 kW). The theoretical part deals with basic distribution of fuel and boilers. The composition and type of fuel are described here in more detail. Further, there is listed the distribution of boilers and emission requirements. The practical part is devoted to the description of the experiment, which was carried out on the testing boiler Dakon Damat Pyro 20 G. The experiment was conducted in accordance with the ČSN EN 303-5 according to which the boiler was testing during certification. The results are discussed and compared according to given standards in the final part