Detailed offer Description Our gas (oil) fired boiler includes WNS type boiler, cast-iron boiler, organic heating carrier furnace and NWTB boiler. WNS boiler has 15 types of steam boiler from 1 to 20t/ WNS series automatic oil-fired, gas-fired boilers were adopted advanced international three-pass and wet back structure. The boilers are matched excellent imported brand burners and high automatic control system. The boilers have the characteristics of reasonable structure, safely running, high efficiency, energy saving and conveniently operation.