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The Calpak Vacuum 160/14 VTN and 200/16 VTN are our latest innovations. They are closed circuit thermosiphonic systems with a vacuum tube collector. The vacuum tubes are equipped in the interior with U shaped copper tubes and aluminum fins that maximize the absorbance of heat.
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The model Giga NS Selective, closed circuit complete thermosiphonic system, is available in various sizes and supports (inclined and flat roof). The tank features a big round flange for easy service and its cover is white with high quality plastic cover. The collector is high Selective which is a flat plate single copper sheet absorber, with laser welded copper tubes. The range of Giga NS Selective model extends up to 200 liters combined with 4,4 m2 of collectors.
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The model Mark 3, closed circuit complete thermosiphonic system, is available in various sizes and supports (inclined and flat roof). The tank features a big round flange for easy service and its cover is aluminum granulated with high quality plastic cover. The collector is a Sandwich type. The absorber is made of 2 sheets of thick steel (8 mm) with integrated canals, painted in special solar black colour. The range of Mark 3 model extends from the model 125/1.5 with a tank of 125 liters and one collector of 1.5 m2 and ends up to 300 liters combined with 4,4 or 5,1 m2 of collectors.
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Natural circulation systems function by the principle that the convection fluid, as it heats up, will naturally go upwards, will exchage heat and then go down.
These systems have: An excellent efficiency, Low maintenance, No electronic or electric appliances are necessary to function.
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