The selective surface (i.e. the absorber plate) of SOLARTEK solar collector is made of aluminium. The absorber plate body consists of monolithic aluminium profiles. The body profiles are fixed to diffuser and collecting pipe profiles by clamping under high pressure; no welding process is used. As a result, SOLARTEK is freed of all problems that may arise from welding seams. It is resistant against high temperature. By creating a turbulence formation within the fluid circulation, every molecule of the fluid is contacted with the surface and as a result, more efficient energy transfer is acquired. When the fluid is inactive, i.e. when there is no circulation, the surface temperature increases to 191 °C. The high pressure that is generated during this process is far from creating a problem for SOLARTEK.

The selective surface (absorber plate) on SOLARTEK copper pipe solar collector is made of aluminium. By a special galvanic coating technique, a selective surface feature was added to the absorber plate which is 0.5 mm thick. The nickel pigmented aluminium oxide coating which is developed to protect its surface characteristics for years, is highly resistant against adverse atmospheric conditions. The water canals of Solartek are made of copper pipes. The attachments of horizontal collecting and diffuser pipes with vertical carrier pipes were made by copper welding; however no welding is used within the assembly of aluminium selective surface and cooper pipes at all. There canals installed to surround copper pipes on the surface and special clips were used for connections.