How do u call that think ??

Question

tubular electric heating element, collapsed in a spiral.

which is boiling water ,,,, in small glass of water???

Answer 1

Immersion Heater Quickly Heats Up Water for Coffee or Tea

Why waste time and energy boiling water on the stove top when you can heat it up in minutes with this immersion heater? Simply set the element in ... Read More

$9.95 at Vermont Country Store

Answer 2

Heating coil. contractor.

Answer 3

look at

Nordic 559 Immersion Heater For Warming Liquids

and

RoadPro RPBH-012 12 Volt Beverage Heater

Answer 4

Usually bought in airports, and handy for brewing up a cup of tea/ coffee,  bought mainly by tourists , and can be multi-voltage.  Not sure of the actual name.