Pool collectors are typically rated by the Florida Solar Energy Center (FSEC) in the same way that glazed collectors are rated by the SRCC under OG-100 guidelines.  Because pool collectors such as the Oasis are un-insulated, the performance drops rapidly with increasing temperature difference as illustrated in the performance curve on the left.

FSEC has developed daily collector output summaries for rated collectors operating at various temperatures. The daily irradiance used for these summaries is 1600 BTU/sq. ft - day, which is typical of a mildly cloudy day.   Most pool collectors will operate in the 95 °F category.