David Hansen wrote:
On Sun, 09 Dec 2007 22:57:02 +0000 someone who may be John Rumm
wrote this:-

Why on Earth are people so antagonistic towards something of which they have
no personal experience?
Why do you assume questions are antagonistic?

Some of the people concerned have given this impression many times
in the past.

Some people may genuinely
want to know if a similar system would be worthwhile for them.

The answer to that question has not changed since the last time it
was discussed. Although I'm not noted for spoon feeding I will make
an exception for once.

There is a question of how one measures things. Some people will
spend 10,000 pounds on a new kitchen, for which they will get a
financial return of nothing, for various reasons which they think
are important to them. Some people will install double glazing,
knowing that it has a number of advantages but saving lots of money
on heating bills is not one of these advantages.

Indeed, although what I think we were looking for were hard data for a
change.

In the case of solar water heating people install it for a variety
of reasons they find acceptable, reducing carbon footprint being an
example.

The carbon footprint stuff is nice in concept but fairly meaningless in
reality. Unless you know the true energy consumption (and the carbon
released during its generation) during the extraction of raw materials,
the production, distribution, installation, and finally disposal of
the system, you can't make any realistic assessment as to whether you
are having a net positive or negative effect.


--
Cheers,

John.

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