105.10  License or certification required.
  1.  Except as provided in section 105.11, a person shall not operate as a contractor or install or repair plumbing, HVAC, refrigeration, or hydronic systems without obtaining a license issued by the board, or install or repair medical gas piping systems without obtaining a valid certification approved by the board.
  2.  Except as provided in section 105.11, a person shall not engage in the business of designing, installing, or repairing plumbing, HVAC, refrigeration, or hydronic systems unless at all times a licensed master, who shall be responsible for the proper designing, installing, and repairing of the HVAC, refrigeration, or hydronic system, is employed by the person and is actively in charge of the plumbing, HVAC, refrigeration, or hydronic work of the person. An individual who performs such work pursuant to a business operated as a sole proprietorship shall be a licensed master in the applicable discipline.
  3.  The board may allow a two-year delay in implementing the licensure requirements for contractors who employ fewer than ten mechanical professionals.
  4.  The board shall adopt rules to allow a grace period for a contractor to operate a business described in subsection 2 without employing a licensed master.
  5.  The board shall by rule provide for the issuance of a license for installers of geothermal heat pump systems that shall require certification pursuant to industry accredited installer certification standards recognized by the United States department of energy.
2007 Acts, ch 198, §10; 2008 Acts, ch 1032, §103, 202; 2008 Acts, ch 1089, §10, 12; 2009 Acts, ch 151, §9, 10