Quote:
Originally Posted by solarhotairpanels
SDMCF
are you using evacuated tube collectors on your system?
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Yes.
I have 4 x 20 tube collectors with twin wall tubes, and 1 x 20 tube collector with single wall, larger diameter, tubes. The larger larger diameter tubes were more expensive. I haven't been able to work out if they perform better - they are supposed to but I haven't confirmed that.
My collectors are plumbed in series with the larger diameter panel last in line. At first I plumbed the 4 collectors as 2 parallel pairs, but changed that. Having them in series greatly reduced the amount of external pipework which cut down on heat losses. In theory. Again, I haven't got any figures to confirm that, but logically it should be so.