Well the element doesn’t have an infinite life, but with that being said, when I worked in the High Arctic we would leave the vehicles plugged in all the time we were not driving. But just as a matter of economics if you were not going to drive it for a week I would plug it in 24 hours before I started it. You don’t mention the Outside air temperature (OAT) but if economics is not a problem and your talking well below zero I would plug it in and leave it. So to answer your question: The element doesn’t have an infinite life but no, leaving it in for a week shouldn’t hurt.
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