Profile: Henan Yuji Boiler Vessel Co., Ltd. is a specialized boiler and pressure vessel manufacturing facility. We are an ISO 9001 certified company. structure of SZS series boilers is D-type arrangement of upper and lower double drums. The convection heating surface is composed of dense membrane wall water pipes between the drums. It has the characteristics of high thermal efficiency, large heat absorption area, strong overload capacity, safe and stable operation.