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First of all, the "block heater" is actually an oil or coolant warmer. It will heat the engine oil or engine coolant depending on location installed, and works similarly to an electric water heater. The rate and maximum temperature that the heating element reaches depends on manufacturer. Circulation of the fluid it heats also plays into how long it will take to warm the engine. In general, the larger the motor, the longer it will take to warm and the more power it will require to stay warm. A 7.3L engine will have a higher volume of coolant to heat where as a 5.9L engine.

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Q: How long does it take an engine block heater to heat up the engine block?
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