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Yes, it would take a ton of power to run it off the car power. Watts = Volts x Amps. So 1500 watts / 12 volts = 125 amps. More than many alternators put out. And a 1500 watt heater still takes awhile to warm up the car. Your coolant warms up faster.
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Winter daily driver, parked most days right now
Summer daily driver
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