Lizard1977: What earthly reason would you need an electric blanket to be "on", but not producing any heat. If it was getting too hot and you wanted to turn down the heat you could drop it down to 1, but if you drop it down to 0, why not just use the off switch, which has the same function?
temp scale of 0 is useful for my elec blanket.....so you can set it to come on high heat for a couple of hours then drop to 0 (or 1 or whatever). 0 just means off though.