Before revision: Though geothermal is not new in the 2018 edition, the title for the 2018 edition was revised to clarify that the code also pertains to geothermal energy systems.
After revision: 2018 EditionThough geothermal is not new in the 2018 edition, the title for the 2018 edition was revised to clarify that the code also pertains to geothermal energy systems.