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You can find solar collectors consist of very thin (1.4-2 mm) glass vacuum tubes made from boric silicate glass. Almost all producers of glass vacuum tubes are located in China where such types of solar collectors are the most popular. Their shock-absorbancy is not sufficient, they are not appropriate for Latvian climate conditions due to regular storms fallingbranches and other objects. Also hailstones can reach dangerous sizes for vacuum tubes. Glass vacuum tubes will notpass EU crash tests and will not be certified in respectable EU laboratories.

The weather in Latvia during the winter often is around 0*C and melting snow can get between the tubes and following cold can damage thin glass. Rarely glass tube collectors fit in with the architecture of building, besides they are less efficient in the summer time.