Vertical rectangular combined environmental protection water heating boiler

The utility model relates to a vertical cuboid combined environment-friendly boiler for hot water supplying or heating, comprising a cuboid boiler body. The utility model is characterized in that the boiler body comprises a main frame formed by a steel water jacket and two main doors formed by the steel water jacket and connected with the main frame via a shaft hinge; a furnace ash chamber is arranged under the boiler body; a rectangular drawer-type grate is arranged above the furnace ash chamber, a heat exchanger is arranged between the grate and the furnace top; a multiplayer inclined heat plate formed by the steel water jacket and communicated with the main frame is arranged in the heat exchanger; a plurality of multiplayer inclined heat fins formed by the steel water jacket and inserted in the heat exchanger from the front side or the back side are arranged on the main doors; a plurality of multiplayer vertical heat fins formed by the steel water jacket and inserted in the combustion chamber from the front side or the back side as well as a heat standpipe of the combustion chamber are arranged at the lower part of the main doors; the heat flow generated by the combustion chamber circuitously flows upwards through a plurality of heat flow channels at the upper part of the inclined heat plate. Therefore, the utility model has the advantages of long passage of heat flow, large heat area, rapid warming, high heat efficiency, easy opening of two main doors and convenient removal of ash and carbon fouling.