Thermal Oil Heater use thermo-oil as heat source, that is to say, we heat the thermo-oil in boiler first and deliver it to heat exchanger with high - pressure pump. After releasing heat, thermo-oil will be returned to the boiler to be reheated. The nature of thermo-oil is different from water; though the saturated temperature is low , it still obtains the high - temperature thermal energy. Because the pressure of TDH is lower than of steam boiler , it is the best consideration for high temperature environment.