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My Jetta had a turbodiesel engine, and it used those things to help the engine warm up faster. It had an EGR cooler (which is also a coolant warmer). Plus it had a housing with some glow plugs in it, to heat the coolant. I don't remember how much current the glow plugs used, but it wasn't anything crazy.
Oddly enough, a lot of the VW guys delete the EGR cooler "because reasons" then complain about the longer warm-up times. LOL
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