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Anytime a person uses an alternator or generator to heat the whole engine it'll actually be heating several times faster due to the fuel burning than due to the electrical energy. Consider, the ICE is usually less than 20% efficient. Maybe as much as 40% but not usually. All that loss of energy is heat. Even if you had a huge 60,000 watt alternator (5000 amps) hooked up to a 60,000 watt block heater and ran that you would be creating about 240,000 watts of heat in the combustion process.
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