Due to technological advancements and an increase in population growth, the need for freshwater has escalated. Several techniques have been developed to produce fresh water, and one of the promising techniques is using the solar thermal desalination process. This study conducts experimental analysis on a single slope solar still employing porous rubber sheet thermal energy storage. Various experiments were performed with water masses ranging from 10 to 25 kg within the basin, comparing these to a similar setup lacking sensible heat energy storage. The results showed that the increased water mass in the basin reduced the distilled water produced from the Solar still (SS) with and without sensible thermal energy storage. The highest distilled water produced from the SS in both cases was at the lowest mass of water. The SS with porous rubber sheet produced maximum distilled water of 0.85 kg/m