Originally Posted by
corporate-wage-slave
I use a nominally 110v heating element, from REI in the USA. Because it's a very simple device, with no circuit board electronics, it works perfectly well on 240v, it is just twice as fast as boiling up.
This sounds like the immersion water coil I carry if I suspect that my hotel room won't have a kettle or coffee maker.
Customs in some countries will want you to report the coffee as an ag/food product.
I've never heard of a TSA limit on (dry/solid) coffee.