Janet Tweedy wrote:

Go on tell us which ONE on the two west's site you would think the best?
The one that looks like a jet engine and hangs in mid air or the other
that looks like an ordinary heater.

janet

The latter - the Bio Arizona. What swings it for me is the thermostat. You can
separate the heater, the controller and the sensor; put each in the best place,
like controller handy near the door - sensor just over plants and heater where
it distributes heat best in your house. The thermostat is not the usual crude
bi-metal or capillary device which are not very accurate, but worse the
settings are not easily repeatable. Though I don't have any specification for
the thermostat a typical digital thermostat will be repeatable and should give
tighter control, enabling you to safely set the temperature closer to your
acceptable minimum; this will save a useful amount of energy.
Do check the operation against a known accurate thermometer. Digital devices
tend to give a false impression of accuracy - you tend to see all those digits
after the decimal point and take it as gospel and it might not be. What it will
be though is repeatable so just so long as you know the errors you can allow
for them.
--
Rod
http://website.lineone.net/%7Erodcraddock/index.html
My email address needs weeding.