Abstract: A closed vapor system includes a boiler arranged to store a vapor and a heating source configured to heat the vapor to a predetermined temperature. A source of pressure maintains the pressure of the vapor in a range of about 100 pounds per square inch to 150 pounds per square inch. Pressurized vapor is drawn from the boiler at a pressure in the range of about 100 pounds per square inch. A motor is responsive to the torque of the pressurized vapor drawn from the boiler and is configured to rotate a shaft. A compressor pump is responsive to rotation of the motor shaft and is arranged to receive effluent vapor from the motor to repressurize the effluent vapor and return it to the boiler. The closed vapor system may function as a battery, vehicle engine and a stationary power source.