The effect on heat transfer and pressure drop is characterized by arranging tubes in helical shape with a different pitch, the experiment is conducted. During conducting experiment the tubular region is maintained by varying the mass flow rate of fluid with the same temperature. After the experiment, the calculated results are obtained, for the same working condition. The average heat transfer rate is increased by 18% by making a tube in helical coil shape over a straight tube. At the same time, the overall heat transfer coefficient also increased by 18% by providing a helical coil shape over a straight tube. Also, the helically coiled tube plays an important rule to improve the heat transfer rate and overall heat transfer coefficient, also raise in pressure drop across the flow. The number of turns and diameter of the coil is important to create turbulence inside the coil. The increase in heat transfer rate with an increase in pressure drop. By comparing with present work we can increase the heat transfer rate by inserting the spring inside the helically coiled tube and also increases by a change in fluid properties. As compared with previous work on the same experiment the helically coiled tube with the minimum pitch we can achieve the high thermal performance