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We need an intro blurb for the Video……    

When we think about water, concepts of purity, cleanliness and freshness spring to mind. But warm the water, store it and circulate it through pipes and suddenly that pure water represents a hazard to human health. The most…

The Evacuated tube collector consists of a number of rows of parallel transparent glass tubes connected to a header pipe and which are used in place of the blackened heat absorbing plate we saw in the previous flat…