The Gaymar Medi-Therm II machine provides a means of regulating patient temperature by supplying temperature-controlled water through a connector hose to a Gaymar Hyper/Hypothermia blanket. The blanket provides an interface for heating or cooling the patient. A patient probe senses patient temperature, which is displayed on the control panel. The Medi-Therm II machine controls output water temperature by mixing hot and cold water using hot and cold solenoid valves under microcontroller control. A circulating pump, heater, and refrigeration unit are also utilized.