I just installed a soft plug block heater in my insight yesterday and used it last night for the first time. It uses 400 watts according to my kill-a-watt
I plug it in in the evening, but that is on a timer which turns on at about 6am and off at 8:30 or so. that gives me time on days where I'm a bit late or a bit early.
I don't have a thermometer at my house right now so ambient temps are from weather undergrounds history data.
At 6am it was approx 38f, I unplugged and started the car at 8am. The Scangauge said 112f and didn't drop.
I will change the start time to 7am tonight and see what its at tomorrow morning.
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