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Dennis@home

On 17/12/2014 09:11, wrote:

Min temp a panel heats is mains cold water temp, maybe 5C in winter.
In an ideal world one would optimise a system by using flat panel to
raise cool water temp, then vac tubes to get it hot. In a large
system this maximises return. In a small system the cost of a 2nd
pump, piping, control etc isnt necessarily justified.

NT

Tubed panels aren't any worse than flat panels once you have a reflector
behind the tubes. In the winter you really need tubed panels to get much
heat.