A vapor generation apparatus includes a fluid channel extending between a first end and a second end of the vapor generation apparatus, a plurality of first fluid passageways extending between the first end and the second end, and a plurality of second fluid passageways extending between the first end and the second end. The plurality of first fluid passageways are between the fluid channel and the plurality of second fluid passageways. The vapor generation apparatus also includes a fluid chamber adjacent the second end and configured to receive a first fluid and a separator adjacent the first end and in fluid communication with the fluid channel, the plurality of first fluid passageways, and the plurality of second fluid passageways. The fluid chamber is in fluid communication with the fluid channel and the plurality of first fluid passageways.