Product Description Horizontal Oil & Gas Fired Steam Boiler 1. WNS Series Horizontal Oil (gas) fired steam boiler, adopting international most mutual three pass all wet back structure with horizontal layout. Fully automatic boiler operation, after the atomization of fuel by burner and the waveform furnace is full of fire, and transfers radiant heat by furnace, this is the first pass. There will form cluster of high temperature smoke in combustion chamber then turn into the