WNS series oil gas fired boiler Yuanda WNS series oil/gas fired boiler adopts horizontal three-pass wet-back structure, large corrugated furnace and patented thread pipe technology, equipped with international first-line brand burners and valve groups, and independently developed high-matching PLC control system to realize multiple linkages. The lock protection function protects the equipment safely. Core Technology: 1. Nitrogen oxide emissions <30mg/m3; 2. PLC control system; 3. The 5th stage water level protection; 4. Flame-out, power failure self-locking protection function; 5. Automatic fault identification function; 6. Data collection, analysis function; 7. Internet of Things remote monitoring.