Conn. Gen. Stat. § 20-334g: Certificate for solar thermal work.

The Commissioner of Consumer Protection, after consultation with either the Heating, Piping, Cooling and Sheet Metal Work Board or the Plumbing and Piping Work Board, as appropriate, shall issue a solar thermal work certificate authorizing the performance of solar thermal work, as defined in section 20-330, to any person who: (1) Has been issued a P-1, P-2, P-3, P-4, S-1, S-2, S-3 or S-4, license issued by the Department of Consumer Protection, (2) has completed a solar thermal installation training course approved by the commissioner, and (3) has achieved a passing score on a solar thermal work examination approved by the commissioner. Such certificate shall be renewed consistent with the renewal process for the prerequisite licenses. The initial or renewal fee for such certificate shall be fifty dollars.