... industrial boiler, which is based on coal, heavy oil, light oil or flammable gas as fuel, steam boiler,hot water. Working ... which is based on coal, heavy oil, light oil or flammable gas as fuel, heat conducting oil as heat carrier. Using recycled liquid ... Saving electricity, fuel, water and electricity, you can recover the investment in 3-6 month.steam boiler,hot water boiler Coal, Oil( Gas ) ...