... produced by complete burning of fuel (coal, oil, gas, etc.) exchange heat with organic heat transfer media in ... according to the difference of boiler type.FuelCoal, water gas, city gas, mixed gas, light oil, heavy oil, residual oil, mixed oil ... system, steam atomization system, air atomization system.Gas-firedFuel gas filter, pressure switch, Gas pressure regulator, leak detection pump, solenoid valve ...