Potential NASA Commercial Applications: Utilizing a water vapor feed is highly attractive for laboratory and small industrial scale electrolyzers. Giner Electrochemical Systems, LLC. is the world's largest supplier of laboratory electrolyzer stack and stack parts. These electrolyzers have excellent proven durability, greatly exceeding five years. However, they require an extremely pure deionized water feed. The ability of a vapor-fed electrolyzer to operate on tap water would make this technology even more attractive for these applications. In a similar fashion to water permeation through an ionomeric membrane, alcohols such as methanol and ethanol can permeate membranes. Thus the static vapor feed technology may be useful in alcohol-air batteries such as those used for portable power. In all these applications, the management of the gases and liquids involved generates significant complexity that inevitably increases the cost and reduces reliability of such devices. As such, they will all benefit from static water vapor feed technologies.