Sigma flat solar thermal collectors , both normal 1,5 and 2 and selective
S 1.5, S 2 and S 2.5 are manufactured at Sigma privately owned factory, using the most updated technology in its domain. according all the international specifications: EN 60335, EN 60335-2-21.
Sigma collectors can be used both for residential and industrial use.
Sigma S1.5 and S2 collectors have obtained the higher certification , the solar key mark.
Their thermal capacity is 520 kwh /m/ year ( Democritus National Certification Institute )
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