Integrated condensation steam boiler

An integrated condensation steam boiler belongs to the field of heating equipment, and relates to a fuel and gas wet back two-return-trace pot shell type hot water or steam boiler. The technical scheme is that the integrated condensation steam boiler utilizes a horizontal two-return-trace structure and comprises a hearth, a boiler barrel, a reversal chamber, an economizer and a condenser, wherein the reversal chamber is arranged at the right portion of the hearth, and a spring type safe explosion door is arranged at the right portion of the reversal chamber. The reversal chamber is connected to a smoke inlet of the economizer arranged in a front smoke box at the left upper portion of the hearth through180-degree rotation of a convection tube bundle, and a smoke outlet of the economizer is connected with a smoke inlet of the condenser. The integrated condensation steam boiler has the advantages that the hearth, a convection heating surface, the economizer and the condenser of the boiler can utilize waste heat