Proposed boilers: - pellet steam steam capacity from 270 kg/h up to 2900 kg/hour - steam boilers with manual loading of fuel from 270 kg/h up to 930 kg/hour - steam coal steam capacity from 270 kg/h up to 2900 kg/hour Automated feeding. Fuel loading for a few days. Easy to operate. One operator can serve multiple boilers. Available steam coal boilers with manual loading of fuel. The lifetime of boilers for proper operation achieves more than 20 years.