... temperature smoke produced by complete burning of fuel (coal, oil, gas, etc.) exchange heat with organic ... the difference of boiler type.FuelCoal, water gas, city gas, mixed gas, light oil, heavy oil, residual oil, ... fuel heatingElectric: resin impregnation, melting&holdingAir-condition: radiant heatingOthers: different application of high temperature heat source below 350°C. horizontal oil fuel (gas ...