I use insulated mug and stainless steel flask in work. Landrover I carry a Coleman petrol stove and whistling kettle along with the frying pan for the bacon sarnies.
Many of my friends have switched from gas stoves to the Coleman after watching mine boil a pint of water in 2 miniuts while they are still warming the gas cylinder in winter.
For occasional use you can get a gas stove for under £10 probably less than a 12v kettle that if they work will take a long time and risk burning your wiring out. By design your cigarette lighter socket is an 8A intermittent load unless you have a dedicated 20A socket as some commercials have.
Paul.
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