Devotion oil / gas boilers refer to boilers whose fuel is oil or gas (such as natural gas, biogas, LPG, diesel oil, light oil, etc.), which can be divided into steam boilers and hot water boilers according to their functions. Devotion oil / gas boilers can be divided into three series: WNS series condensing horizontal internal combustion boilers, SZS series condensing double drum vertical boilers and DHS / QXS series angle tube boilers. All adopt a large furnace design, with a thermal efficiency of over 98%, and at the same time have the characteristics of fully automatic and safe operation.