SitongWNS series steam boileris a kind of safe and high efficiency heating equipment with full automatic control system. Except natural gas, the boiler can also burn other oil or gas fuel, such as city gas, LPG, diesel, heavy oil, etc. The steam boiler is fast assembly fire tube boiler with three pass structure, it has compact structure, small volume, strong load adaptability and low water quality requirement. This boiler adopts wet wet back structure, it can adapt to the high temperature, has a good sealing, increase the radiation heat transfer area and improve the heat transfer efficiency.