Oil heater for marine boiler China Deyuan Marine Fitting Co.,ltd . Pin ... extended heat surface. It is used for heating of different oils, for example, boiler oil, diesel fuel-oil, lubricating oil ... this pin-tube oil heater, which is more effective for heat transferring, small cubage, light weight etc. ... t exist; it can work in any rigor condition for a long time. 2. specifications and typical structures ...