Small gas normal pressure hot water steam boiler

The utility model relates to a small gas normal pressure hot water steam boiler, and belongs to the technical field of machinery equipment. The small gas normal pressure hot water steam boiler comprises a boiler main body, wherein a burner is arranged at the lower end of the boiler main body; an atmosphere communicating hole is formed in the top end of the boiler main body; a vent hole is formed in one side of the top end of the boiler main body. The steam boiler is characterized in that a vertical heating pipe is arranged on the inner side of the boiler main body and comprises a vertical fire-adding heating pipe and a vertical fire-reducing heating pipe, wherein the tail end of the vertical fire-reducing heating pipe is connected with a draught fan and an integrated circuit igniter. The small gas normal pressure hot water steam boiler has the advantages of simple structure, convenience for use, short heating time, no pollution, water source conservation, high safety performance, low construction cost and con