Optimization of heat exchangers, which are frequently used in many industries such as air conditioning, automotive, aviation industry, is very important today. Optimization is needed to optimize production and operation costs. The purpose of this study is to design an optimal circuit for improving heat transfer in finned tube heat exchangers. Performance in finned tube heat exchangers where water is used as work fluid is directly related to the homogeneous distribution of the temperature difference between the water temperature and the air temperature throughout the heat exchanger. If there is no homogeneous distribution, air velocities on the surface will cause differences between the circuits due to air flow and temperature temperature distribution. Such as this situation will reduce the performance of the heat exchanger. For this reason, the design of the circuit for the heat exchanger is very important to achieve a homogeneous temperature distribution. Literature studies have shown that with the number of rows and the number of circuits increases the importance of the circuitry optimization in finned tube heat exchangers increase as well. Most of the circuitry optimization studies have been done with refrigerants and the studies with water as a work fluid are limited. In this study, numerical studies were carried out to determine the circuitry for ensuring the maximum average temperature difference between fluids (water-air) and a circuit optimization was performed according to these studies.