My electric blanket uses about 60 watts at its highest temp. There is no central heating in my house, just individual heater/air conditioner units. I purposely bought my electric blanket to beat the cold winters w/o spending a fortune on heating the room. Perk is that you actually sleep much better with a cold room. Scientific fact if I remember correctly. hehe...
A friend of mine visited his doctor and was told that sleeping with the blanket on (especially if it is under you) is bad for your back though. Probably the best thing to do would be to only use it to make your bed warm for when you first get into it.
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