Solar water heating is one of the most successful applications of solar thermal technologies. Extensive research is being performed to further improve the performance of solar water heating. This research is aimed at investigating the performance analysis of a vacuum tube solar water heater. The method adopted involves the use of the measure of solar water heater performance which is the collector’s collection efficiency (η), which is a generalization from the Hottel Whillier equation. The results obtained shows that the solar water heater performs at 64% efficiency. The results also imply that the system can heat water to a suitable temperature at sunshine hours (9:00am to 4:00pm) local time and can be used to heat water for domestic, commercial and industrial uses.