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Flat-plate collector for converting radiant energy into thermal energy, as part of a solar thermal system; approx. 220 cm long copper pipe spiral on copper plate in collector chamber, black coated, with removable, transparent cover, opening with silicone plug for measuring the temperature in the interior;Copper is a very good heat conductor, the material and the long length of the spiral make the heat transfer from the interior of the flat-plate collector to the water circuit very effectiveCopper pipe: Da = 6 mmCollector dimensions: 172 x 127 x 50 mmTotal dimensions: 200 x 127 x 50 mmMass: approx. 720 g