Quote Originally Posted by sundad
Heliocol is one of the least efficient collectors on the market...... For a comparison of collector efficiencies, check out the ratings at the Florida Solar Energy Center's web-site. Bear in mind that the tests results posted are the best the products can do. The tests are conducted at next to zero wind speed. THe greater the wind speed the less heat a solar collector will deliver. Collectors with exposed tubes (especially Heliocol) cool off much faster than those with no exposed tubes (like Techno-Solis).
This is sooo confusing. When I looked at the FSEC website, I found that the Heliocol is rated at 1000 btu/sq ft and the Techno-Solis is rated lower at 958/btu/sq ft. Here is the link to the site:

http://www.fsec.ucf.edu/solar/testce...tr/tprpool.htm

Am I missing something?