Abstract: A shower temperature control system includes a single mixing valve connected between hot and cold sources of water and a shower head, a gear motor with a shaft connected to the mixing valve, a water temperature sensor positioned in the shower plumbing, a numeric keypad for numeric entry of desired shower water temperature, a potentiometer for alternate entry of desired shower temperature, and a controller which derives a motor drive signal from a difference between the sensed temperature and the set temperature. Initially, and when no temperature has been set, the controller maintains a safe default water temperature, such as 98.degree. F. The controller incorporates memory for the storage of a plurality of preset shower water temperatures which may be selected by selection keys on the keypad.