SOLAR ENERGY DEVICE includes equipment and materials (and parts solely related to the function of such equipment) that is intended to be or located on or affixed to real property within the city and that uses solar energy directly to
      (1)   Generate electricity,
      (2)   Heat or cool a building or structure,
      (3)   Provide process heat or mechanical energy, or
      (4)   Provide hot water for domestic service or for recreational or therapeutic purposes.
   Generally, these functions are accomplished through the use of equipment such as collectors (to absorb sunlight and create hot liquids or air), thermostats (to activate pumps or fans which circulate the hot liquids or air), and heat exchangers (to utilize hot liquids or air to create hot air or water).
('86 Code, § 24.02.140) (Ord. 3916, passed - - )