On Sat, 05 Sep 2009 19:16:23 +0100, "Dave Plowman (News)"
wrote:

In article ,
William Sommerwerck wrote:
Those can be fine, accuracy-wise. But of very limited use. After
all, it's not difficult to work out what most appliances cost to run.

When I get around to it, I'm going to put it on my fridge for a few
days. I want to see exactly how many kWh it draws over a week or so. You
can't do that with a clip-on, because refrigerators run intermittently.

That's true - but what action will you take? You can hardly switch it off
to save energy. Unlike heating and aircon. If it's old a new one will
almost certainly be more efficient. But may cost more than it saves.

My sister replaced her old (died) fridge this spring. The old was not
that old, about 6 years, IIRC. The new was a model considered energy
efficient. She did notice a drop in electrical consumption with the
new one, and figured that the new one would have paid for itself in
about 4 to 6 years.