... oil, light oil or flammable gas as fuel, steam boiler,hot water. Working principle: The boiler ... is industrial boiler, which is based on coal, heavy oil, light oil or flammable gas ... rank of load. Saving electricity, fuel, water and electricity, you can recover the investment ... 6 month.steam boiler,hot water boiler Coal, Oil( Gas ) Fired Heaterthermal Boiler,steam boiler ...