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Thermic fluid heaters and its working temperature is always a perplexing term and it is also mostly misunderstood expressions. Generally, all thermic fluid manufacturers recommend certain economic operating temperature or optimum fluid bulk temperature based on its useful life of the product. Hence, the manufacturer of Thermic Fluid Heaters recommends a continuous operating temperature of 300 ° degrees Centigrade for such a heater in their expectations or estimation of temperature profiles. But it is important to understand various aspects of temperature when thermic fluid flows through tubes of heater. When fluid flowing in the coils or tubes of the heater, a very thin layer of the fluid all along the metal periphery vehemently adheres to the solid metal very strongly. This layer never moves and form a film or layer which is a stationary oil film. This film creates very high resistance to heat flow from outer heated metal surface to circulating thermic fluid. This resistance depends