No. ENERGY STAR certification under the Residential Water Heater Program is only available for complete solar water heating systems. The entire system must be certified under the OG-300 program to qualify for ENERGY STAR. And since OG-300 systems must make use of a solar thermal collector certified as a component to OG-100, all ENERGY STAR certified water heaters do include OG-100 certified collectors. But ENERGY STAR certification is not available for the collector alone.