"Andy Hall" wrote in message
...
On Wed, 30 Jul 2003 12:15:43 +0100, "IMM" wrote:


"Andy Hall" wrote in message
.. .

I mentioned electronic thermostats in my
other post. Another feature
of these is setback where you can drop
the temperature at certain
times rather than off completely.
Once adjusted suitably, you will
get greater comfort. Also it can be less
expensive to run if you just
drop the temperature by 6 degrees
or so overnight rather than
completely off.

Do have any figures to prove this?

Actually yes, but first let me make the point that I did say *can* be
less expensive, not *would* be. It would depend on the circumstances
I am sure.

There was, on average, a 3-5% lower
use of gas when setback was used.

What about comparison to optimised start and stop?

In the 1960s the electricity
boards had a slogan "Lag It And Leave It", saying lag a cylinder and
leave
the immersion heater on 24/7. Under tests this was slagged as highly
uneconomical. Switching the immersion on when needed or on a clock was
proven to be far more economical.

At that point it probably did. WIth today's insulation, and I have a
100mm layer around my cylinder,

The point is that the older cylinders can be equated to heating systems. Not
so much today.


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