Thermal oil boiler(heater) is a new type of heating equipment, with oil, gas, coal, biomass as fuel and flue gas as heat source, heat conduction oil as the heat carrier, through the circulating pump to force heat transfer medium to circulate in liquid phrase, and transfer heat to heat user equipment, then return to the heating furnace for re heating high temperature, low pressure, energy saving equipment. Thermal oil boiler can heat temperature to as high as 340℃,and generally under working pressure at 1.0 MPa, which will be safe and reliable because of working in liquid state.