- Those portions of the piping that are used to help prevent the system from overheating shall not be required to be insulated.
- Those portions of piping that are exposed to solar radiation, made of the same material as the solar collector absorber plate and are covered in the same manner as the solar collector absorber, or that are used to collect additional solar energy, shall not be required to be insulated.
- Piping in thermal solar systems using unglazed solar collectors to heat a swimming pool shall not be required to be insulated.
Exception: Where the winter design temperature is greater than 32°F (0°C).
Exception: Expansion tanks shall not be required in drain-back systems.
Heat transfer fluids shall be in accordance with SRCC 300. The flash point of the heat transfer fluids utilized in solar thermal systems shall be not less than 50°F (28°C) above the design maximum non-operating or no-flow temperature attained by the fluid in the collector.