We have testing agencies that will happily test your mains connected electrical devices and allow you to use the agency symbol if your device passes their battery of tests and determines that it is safe for consumers to use. Bigclive.com shows us that there is a company that is making a device that works well but is dangerous as hell. The device he found basically connects mains voltage directly to exposed electrodes that can be dunked into a cup of water. Might as well just strip the wires from an extension cord and dunk it into your coffee cup! A safe version of this product can be seen at the beginning of the video that shows a heating element that operates just like a heating element on your stove where the live electrode is run in the center of a metal sleeve which is also often grounded. Interesting thing is that the plug is a North American standard type which is 110VAC and he is plugging it into a plug converter that is connecting it to 220VAC. He has it connected to a power meter and it is consuming the rated power. A look at the data sheet does confirm that the device is rated for 220VAC. Strange since it has a 11VAC plug…
If you operate the device as it says, never in a metal cup, never stick your fingers in the water when operating etc then chances are you would never have a bad day with this item but of course shit happens and this is bound to happen which is the same reason desk fans have guards around the blades instead of a warning not to stick your fingers into the blades when operating.