Mary Fisher wrote:

I have also given the url.

Must have missed that...

The solartwin one?

OK I have downloaded and read through the installers manual....

Interesting system... the "direct" plumbing approach solves a number of
the normal complications of similar systems (although introduces some as
well).

What form of water softening do you use with it, or do you have soft
water in your neck of the woods anyway?

Most people seem to think that the payback time is the most important aspect
of such installations. We don't (we don't consider the payback time on
anything else we buy either) but for those people we've worked out that on
present gas prices we'll recover the cost in ten years (if we live that
long). I doubt that present gas prices won't stay what they are so nobody
can determine what the payback time will be.

Payback time is only one measure as you say (although in many cases the
economic cost of an activity also has a good correlation with its
environmental cost as well)

Have you made any estimate of its heating power on a sunny day?

That includes you and Parry and all the other sceptics.

Why do you call me a sceptic? The only scepticism that I expressed with
regard to solar water heating, was when used with a combi boiler that
does not also have some form of storage. For example the system you have
would be of no practical benefit in this circumstance since the flow
rate through the panel is far to low to do much in the way of either
pre-heating the inlet water or directly blending with the output of a
combi.


--
Cheers,

John.

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