Do-It-Yourself Water Heating Solar Collectors Comparison

Now fully assembled, our group of water heating solar collectors finally have their day(s) in the sun to prove how well they work.

071 water heating solar collectors - main view
The candidates for our water heating solar collectors comparison are mounted in place and ready for their days in the sun. Shown from left to right are the Suntree Solar, the SolaRoll, the BTU Bucket, the unknown /and subsequently eliminated/ commercial panel, MOTHER EARTH NEWS' single-plate in-line and our double-plate in-line (both copper-equipped).
PHOTO: MOTHER EARTH NEWS STAFF