Photovoltaic system is one of the promising electricity generation devices due to its direct solar energy conversion, safe power transmission and practicability. However, its performance is very sensitive to high temperatures. Photovoltaic/Thermal systems were presented for enhancing the electrical efficiency and making use of the lost thermal energy. In this research, a combined usage of Paraffin as a phase change material, and a stainless-steel porous media was used to decrease its temperature and use its thermal energy. Two different systems were used for comparison. One contains Stainless steel wool with paraffin, and the other contains Paraffin without porous media. Three flow rates of 0.3300, 0.330, and 0.3300 L/s were used of water as a heat transfer fluid. It was found that, for all the tested flow rates, the system with a porous metallic media achieved lower surface temperature, higher electrical efficiency, and higher overall efficiency. The temperature of the PV cell decreased by 5 to 25⁰ C. The enhancement achieved was from 10% to 28% in the overall efficiency, and 1% to 4% in the electrical efficiency. This emphasizes the importance of the porous metallic media in enhancing properties of Paraffin as a phase change material when using with the Photovoltaic modules cooling.