At the Ecobuild 2011 Practical Installer demonstration stage, an instructor shares tips on the installation of solar thermal evacuated tube collectors on a mock-up roof. (Photo by Mignon O’Young)

At the Ecobuild 2011 Practical Installer demonstration stage, an instructor shares tips on the installation of solar thermal evacuated tube collectors on a mock-up roof. (Photo by Mignon O’Young)

At the Ecobuild 2011 Practical Installer demonstration stage, an instructor shares tips on the installation of solar thermal evacuated tube collectors on a mock-up roof. (Photo by Mignon O’Young)