Sustainable energy development is the key factor for the production of green hydrogen through water splitting from renewable energy. Alkaline water electrolysis (AWE) is the most economical and realistic method to enhance the hydrogen productivity and its purity. Due to this aforementioned reason, a method for simulating the alkaline electrolyzer for hydrogen production is provided in this study. The entire simulation is carried out on Aspen Plus whose outcome has been confirmed in reference to the parameters of the experimental study, which serves as an interaction between thermal and electrochemical parameters. Study reveals that, at 7 bar pressure and variable temperature with the variation in cell number (i.e., 11, 12 and 13) affects the amount of H2 produced and its purity. Also, it has been observed that at a 50 °C, the maximum amount of hydrogen has been reported at 8.215 Nm3/h with the gas purity of 99.89% at 0.6 A/cm2 of current density. The maximized stack power has been accounted at 14.96, 16.32 and 17.68 kW at 50 °C by execution of 11, 12 and 13 cell numbers individually.