Build 3 Passive Garden Heaters - earthworks.iron.passiveheat PEP BB

This is a badge bit (BB) that is part of the PEP curriculum.  Completing this BB is part of getting the iron badge in earthworks.

For this BB, you will create 3 passive garden heaters!


(source: Passive Solar Garden Heater - permies.com thread)

For more information, please read the permies.com thread about Passive Solar Garden Heater.
Related topic: The Truly Passive Greenhouse

Minimum Requirements:
  - 20 foot deep 6 inch hole in the ground with steel casing
  - 4 foot tall cap with glass on south side
  - black ¾ inch tube exposed to glass and reaching bottom of hole
  - note that glass needs to not block UV

To get certified for this BB, provide proof of the following as pictures of a video (<2 mins):
  - equipment and materials at the build site
  - partway through the building passive garden heaters
  - completed passive garden heaters