CLSW vertical biomass hot water boiler has a feeding system - automatic feeding system. The boiler will automatically feed during normal operation, and the feeding time can be adjusted according to the actual situation. It has the advantages of no backfire, not easy to jam, low failure rate, uniform feeding without dead angle, etc. Combustion system - adopts positive pressure blowing, negative pressure induced draft dynamic cyclone and vortex combustion structure, and is equipped with a cyclone device in the combustion chamber. Under the action of positive pressure blowing and negative pressure induced draft, the flame in the combustion process is forced to rotate. The unburned suspended matter (particle fragments, powder) will not be immediately taken away by the induced draft fan, but will be fully gasified during the rotating combustion process to achieve the effect of complete combustion, greatly improve the thermal efficiency, and reduce the operating cost.