Oil heater for marine boiler China Deyuan Marine Fitting Co.,ltd . Pin-tube oil heater consists of an outer shell and an inside shell ... pin tube extended heat surface. It is used for heating of different oils, for example, boiler oil, diesel fuel-oil, lubricating oil, fuel ... surrounding the oil in this pin-tube oil heater, which is more effective for heat transferring, small cubage, light weight etc. ...