When I was looking to buy a slow cooker I didn’t find much on specific power usage. I guess it depends on your model, but even general figures were hard to find. Now I’ve got one, here’s the deal;
Morphy Richards 3.6 litre crockpot (bought from Argos in Sept 2010)
The readings I took for cooking a full meal for 10.5 hours (high at the start, the low for most of it, then warm for a while), used 1.23kw of electricity. There’s no thermostat so it idles along at whatever power setting you’ve chosen. At today’s UK energy prices you might be looking at 12p per kw of energy, and therefore about 15p to slow cook a meal.
It’d be interesting to know how much energy it would take to cook this purely on the hob, in some ways I’m guessing it might be cheaper, but the convenience of the slow cooker for some meals is what appeals.. plus 15p isn’t exactly expensive.