1. Low Management Costs: No need for boiler operation permit, and operators do not require a certification to work. 2. Energy-Saving: This series of coal (wood) hot water boilers are made of aluminum alloy, stainless steel, or carbon steel. They are mainly composed of components such as headers, drums, furnace pots, furnace heads, chimney pipes, and transverse water pipes, specifically designed for biomass fuel, coke, anthracite, and other difficult-to-burn fuels. The combustion method uses a fixed round-hole grate, and the furnace top is equipped with a radiation arch, reducing the water cooling of the furnace and enhancing combustion intensity. The arrangement of high-temperature convection flue pipes increases the convection heating surface, strengthens convective heat transfer, significantly improving the boiler's thermal efficiency compared to traditional vertical hand-fired boilers, enabling fuel to achieve complete combustion.