As used in this chapter, the following terms shall have the meanings indicated:
Any equipment, device, or apparatus, or any part thereof, which is installed, affixed, or situated outdoors or in any accessory building for the primary purpose of combustion of solid fuel such as wood, coal, corn cobs, wood or coal pellets or other combustible solid fuels to produce heat or energy used as a component of a heating system providing heat for any interior space or water source.