Haw. Rev. Stat. § 269-44: Solar water heater system standards.

Not later than July 1, 2009, or as soon as reasonably practicable, the public utilities commission shall adopt or establish by rule, tariff, or order, standards for solar water heater systems to include, but not be limited to, specifications for the performance, materials, components, durability, longevity, proper sizing, installation, and quality to promote the objectives of section 269-124.