According to an aspect, a vapor powered apparatus for generating electric power includes a liquid chamber that contains a working fluid and a first heat exchanger that transfers heat from fluid coming from a heat source to working fluid coming from the liquid chamber, where the transferred heat vaporizes at least a portion of the working fluid to provide a working pressure of the vaporized working fluid. The apparatus includes a pressure motor to convert the working pressure of the vaporized working fluid into mechanical motion for a power generator. The apparatus includes a vapor chamber to capture the vaporized working fluid and a second heat exchanger to use working fluid from the liquid chamber to condense the captured vaporized working fluid. An exchanger fluid system provides the working fluid to the second heat exchanger from a bottom portion of a pool of working liquid in the liquid chamber.