Most military structures use hot water not only for bathrooms/showers, but also for heating. A properly sized/located solar water heater system could be used to heat this water year around (excluding extreme latitudes). Large aircraft hangers would be the most cost effective locations to modify first as their large roof area and abundance of sunlight (even during winter months) could supply generous amounts of solar heat to decrease the demands on the boilers already in place. Let alone these buildings with their large internal areas and soaring ceilings make heating extremly expensive.
Idea No. 8704