A cabinet mounted, single power door (vertical sliding), vacuum, sterilizer utilizing facility supplied steam. The unit is controlled by a microcomputer that monitors and controls all unit operations and functions and provides both audible and visual indications of deviations. A printer-recorder documents and records each cycle performance. For general purpose pre-vacuum or gravity steam sterilization of hospital and laboratory supplies at temperatures in the range from 110°C to 135°C (230°F to 275°F). A liquid cycle is also provided at temperatures in the range from 100°C to 121°C (212°F to 250°F).