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AFAIK the windshield washer nozzles are heated only to prevent them from freezing solid when wet from rain or covered by snow.
The washer liquid should have some anti-freezing component and does not need being heated.
Usually it contains some alcoholic stuff that evaporates on the windshield and cools it down; making it fog up on the inside.
Come winter I use an insulated sunshade on the window instead.
It even keeps the car warmer by half a degree by blocking the cold sky faced surface. I usually don't have to deice the side windows when I use it; just the rear window.
I may start covering the rear window too. That must help even more.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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