Strong thermal ecological insulation of pre-compressed stone wool, 60mm thick, coated with black glass fabric, to minimize thermal losses. Thermal conductivity of stone wool insulation: λ=0.035 W/mK (DIN 56612, measured at 0°C).

The return and supply pipes (headers) they are perforated with expansion outwards, for the ultimate fit heat absorption pipes (manifolds) and avoiding the pressure drop in the collectors.
Distance between tubes (tube pitch)=93mm (EN 1652).
Single selective absorber from a selective metal sheet (Sun-Selective, Complete area absorber), of high absorption and low emissivity, which covers the entire surface of the window as well as the supply and return pipes, increasing the absorptive capacity of the collector. Welding is done with state-of-the-art robotic technology equipment laser.