Upper energy vacuum hot water boiler is divided into ZWNS-Y type fuel oil, ZWNS-Q type gas and ZWNS-D type electric heating vacuum hot water boiler three kinds. Shangneng ZWNS vacuum boiler series all use water boiling at low temperature under low pressure to produce steam, and the working principle of heat transfer through the condensation of soft water to achieve efficient operation of the boiler, so as to achieve the purpose of energy saving. This product can be widely used in various places.

ZWNS Vacuum Boiler with Low NOx (NOx < 30mg/m3) is designed based on the original ZWNS Vacuum Boiler, which has three return. The Low NOx type ZWNS adopting a FGR with four-return heat transfer structure (invention patent No. : ZL 2015 10428578.1). Higher thermal efficiency, lower combustion reaction zone temperature, and finally achieve ultra-low nitrogen emissions (NOx < 30mg/m3).