Boilers of the Bratsk-M series are designed for heat supply of buildings and structures for various purposes. The boilers operate not only on screened bituminous coals, but also on ordinary bituminous and brown coals with a lump size of up to 60 mm and a content of fine particles (less than 6 mm) up to 50%. The boiler delivery set includes a mechanical furnace with a control cabinet, which consists of a furnace bed, an electromechanical drive bar, a fuel bunker, a fan, a secondary blast collector with a roof. The boiler heating surfaces are two staggered packages of cast-iron sections mounted on a brick pedestal. The two-way movement of gases is carried out along the convective surface of the sections. Gas inlet - through a water-cooled steel chamber. The control cabinet provides automatic operation of the boiler and its protection in case of deviations from the permissible values: pressure, water temperature and discharge in the combustion chamber, as well as signaling in case of an emergency.