On Tue, 01 Nov 2011 20:44:40 +0000, Roger Chapman wrote:

A wasting investment of £15000 needs to pay £600 pa just to return the
capital in 25 years. At 21p that is 2857 KWH just to recover the
capital. Dodgy.

Is it? Harry's system has produced about that over, admitedly summer,
6 months...

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Cheers
Dave.