The following are the general products of oil heaters: The M/E and GE FO heater that lowers viscosity and increases the flash point in the engine by heating the fuel oil. The HFO purifier heater lowers the heavy fuel oil’s viscosity and helps remove impurities by heating up to the temperature showing the best efficiency of the purification device, and the LO purifier heater that heats up to a proper temperature in order to remove the impurities of lube oil used for the engine.