"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? Unless it is sluggish UFH, setting the
temp back does not result in greater economy. 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.

In commercial buildings a low temp limit of 10C is maintained as under this
temp the fabric of the building and its furnishings may be effected. A good
optimum start stat as the Honeywell CM76 is the best way. It works out the
right time to start the system to reach the target start temp.



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