Katz makes a 300 watt 12v electric heater that has to be hard wired to the battery but it's a special order from the auto part store and they couldn't give me a price, my thought on the higher electrical load is that it will make the engine work harder so it warms up faster, so if the whole point is heat right now then why not go electric? it takes my car 4-5 miles to get warm enough to put out heat.
with a 15 amp outlet you have 1800 watts of power avalible to you, a small electric 1000 watt space heater in your car and a 500 watt block heater running off the same 12 gauge cord should be ok if nothing else is plugged in.
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