SZL water tube quickly installed (assembled) steam boiler has 2 vertical steam drums, and the innovative horizontal cyclone-fired combustion chamber, which could effectively enhance the thermal efficiency and reduce the flue gas emission concentration. The boiler installs one cast iron economizer at its back body, the grate applies the chamber-separated ventilation structure, which is easy to adjust. Advantages of such boiler are: strong power, high thermal efficiency, 110% overload capability, compactly designed, small floor area. Customers appreciate its safely operated, investment conserved, and broadly fuel adapted.