There are many types of energy-saving boilers, not just biomass boilers are energy-saving and environmentally friendly boilers. The types of boilers can be divided into: steam boilers, hot water boilers and organic carrier boilers. Energy-saving and environmentally-friendly boilers are distinguished from fuels. Energy-saving and environmentally-friendly boilers include: gas boilers, oil-fired boilers, biomass boilers, alcohol-based boilers, and electric boilers are environmentally friendly boilers. The above types of boilers have no difference in function. Using the heat provided by the fuel, the water is converted into hot water and steam to meet the needs of heating, power generation, disinfection, and drying.