il Heater is used to heat a fuel oil and lubricant oil for ships by using the steam generated from boiler. There are several type of oil heaters in the market: M/E & G/E F.O. Heater breaks the viscosity of fuel oil, while increase inflammable point; H.F.O. Purifier Heater breaks the viscosity of fuel oil of heavy fuel oil, and also increases oil temperature up to the degree which helps purification process. ; and L.O. Purifier Heater increases oil temperature up to the degree which helps purification of lubricant oil used in engine.