Sigma manufactures in its factory situated at the Volos Industrial Area , evacuated tube collectors, using the highest quality MADE IN GERMANY evacuated tubes .
Sigma has chosen the ''heat pipe '' type , ( not the '' direct flow '' ) suitable to Greek temperature, in order to avoid overheat.
- High performance vacuum tubes
- Top performance through anti reflex coating and double-sided coating, highly selective absorption surface
- patented glass-metal connection from a highly experienced glass manufacturer protecting the vacuum long-term
- tube connection through a plug connection
- tubes able to be rotated and individually oriented
- even tube spacing with the interconnection of multiple modules
- self-supporting construction
- light weight
- low fluid volumes
- low pressure loss
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