Horizontal gas normal-pressure hot water boiler

The utility model provides a horizontal type gas normal-pressure hot water boiler. The horizontal type gas normal-pressure hot water boiler comprises a hot water boiler body, a gas burner, a tail gas purification assembly, a waste heat recycling pipe and a heat insulation layer. A water storage furnace cavity is formed in the hot water boiler body, a gas burner is installed on the front side of the exterior of the hot water boiler body, an exhaust port is formed in the rear side of the exterior of the hot water boiler body and connected with an exhaust pipeline, and a tail gas purification assembly used for purifying waste gas is arranged on the exhaust pipeline. A spirally-wound and water-through waste heat recycling pipe is arranged on the inner wall of the exhaust pipeline, a water outlet pipe and a water inlet pipe are arranged on the front side and the rear side of the top of the hot water boiler body respectively, and the water inlet end and the water outlet end of the waste heat recycling pipe extend o