I found this while surfing: Heated Mirror Demisters
"Finally there is a simple solution to those misted up mirrors in
your
bathroom.
Running costs are negligible - based on one hours use per day, an
average demister will cost just 2-3 pence per week to run - a small
price to pay for permanent mist free mirrors!" http://www.floorheatingsystems.com/demisters.htm
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