I use a 1,600W heater on my VW Golf. (110V). The neat thing is that it doesn't have a pump. It's placed lower than the engine. As the water heats it starts to boil causing steam bubbles to form. Since the heater is placed as low as possible, these steam bubbles rise into the engine, pulling water along with it which also causes water to be sucked into the heater too. The way I have it set up some hot water also goes into the heater element inside the cab. By the time I start it I get instant heat. Of course I need a 110V outlet. When I'm stuck away from an outlet I can't even get the car to start when it gets too cold.
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