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My hunch is that two heaters will heat you up more than twice as fast as a single heater. While you're waiting for your engine to get hot, it's shedding heat to its environment, and the less time you spend doing that, the greater the efficiency. But you'd have to be more careful about how long you leave it running, so as not to waste too much electricity.
Worth an extra >100 Euro? Probably not.
Are you sure you can't get a $20 block heater off Amazon.com?
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