IEA-SHC Task Force 39 A consortium of companies and government agencies (most non-US) from around the world looking into polymer-based solar thermal collectors.
Acrylic Double-Skinned Panels
Companies Producing Polymer Collectors
http://aventasolar.com/ (Norway) Special polymers that can (presumably?) withstand high stagnation temperatures.
http://www.harpiris.com/ (US) An "all in one" passive system with plastic/copper tubing.
http://powerpanel.com/ (US) Solar thermal/PV systems with aluminum absorbers.
http://www.fafco.com/ (US) Pool heaters mostly
