This comparative analysis is carried out to clarify the performance of refrigerator connected with water cooled condenser using R-134a and R-600a refrigerant. The refrigerator uses the vapor compression cycle in its process. Its performance is the major criteria. As there are many researches still under way to find out the improved efficiency of the system. This article presents the effect of the water cooled condenser in the COP of the domestic refrigerator. The aim of this article is to compare the COP of the refrigerator using R-134a and R-600a refrigerant connected with water cooled condenser. This experiment is conducted in a domestic refrigerator (Godrej Classic) of 165 liters of capacity assembled with a test platform. In this study an innovative water cooled condenser for residential refrigerator was introduced. In this experiment it is observed that the COP is increased by 34.71% using R-600a refrigerant. The thermal properties at different points in the refrigeration cycle were measured for typical operating conditions for both the refrigerant.