Thermal storage is a key subsystem in any solar thermal application. It stores thermal energy during periods of high solar irradiation so it can be used when solar irradiation is low and during the night. The energy extraction efficiency is influenced by design and by such operational factors as the state of charge of the thermal storage under normal conditions, a solar thermal storage system is in a partially charged state. This study was aimed at developing charged thermal storage with emphasis on the effect of inlet design, storage tank wall material, and the presence of fluid dead zones.