This work is a follow on to previous ones on solar tracking in Tropical Africa by the authors. While the first work showed the necessity toreplace current fixed panels/collectors with two slope fixed installations at prescribed angles and times, the second established the need for - anddetermined the constraining techno-economic factors of tracking photovoltaic panels in rural Africa. This paper covers the introductory part oftracking passive flat collectors as would be applied in hot water cylinders (domestic water geysers) in these areas.