I have had no problems with mist or ice.
Maybe "arctic" -spec cars have more power on those heaters?
When there is layer of thin ice on the mirror it is melted after about one minute drive.
When there is mist and rain my mirrors stay dry. I have come to conclusion that mirror heating is on when wipers are on.
I live by the sea and I was afraid that misty mornings my mirrors will be useless as there is no switch to turn heating on. But this has not been a problem at all.
I am satisfied with my mirrors heating.
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