shangneng zwns low-nitrogen (nox <30mg/m3) vacuum hot water boiler is based on the original three-pass return of zwns type vacuum hot water boiler, adopting a four-pass heat transfer structure independently researched and developed (patent number: zl 2015click to see more
the shangneng vacuum hot water boiler is divided into three types: zwns-y type fuel, zwns-q type gas and zwns-d type electric heating vacuum hot water boiler. the zongs vacuum boiler series of shangneng uses water to generate steam at a low pressure to geclick to see more
