Aquifer thermal energy storage systems allow the storage of excess heat from summer for use during the winter. This investigation looks at the suitability of a small-scale experimental model as a method for simulating the behaviour of full-scale unconfined aquifers for thermal storage. Thermal energy was stored via the injection of 40, 60, and 80 °C water for a period of 1000 s with extraction being between 1000 and 2000 s. Furthermore, periods of storage between injection and extraction were introduced to simulate potential full-scale heating and cooling demand scenarios. Thermal efficiencies were found to be 60% reducing to 53% with the addition of a 1000 s storage period. Furthermore, for the model tested in this investigation the temperature of the injected water was found to have little influence upon the efficiency
