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Orbiter radiator performance provides the most variance in determining the amount of Shuttle Transportation System (STS) Orbiter water available for transfer to the International Space Station (ISS). As radiator performance decreases, dependence upon the Flash Evaporator System (FES), which requires Fuel Cell (FC) water to reject the Orbiter's waste heat, increases. Generally, radiator performance decreases as the ISS assembly size increases (especially as solar arrays are added), and also as beta angle increases. A parametric study has been accomplished that provides a quick-reference table for determining the amount of Orbiter water available for transfer during ISS missions 2A.2 through 7A.1. An hourly Orbiter net water generation rate is reported according to variations in ISS assembly configuration, beta angle, ISS attitude, Orbiter radiator configuration, and Orbiter heat load. Those permutations of higher probability of occurrence than others have been identified.