"Kettle" is an interesting word because when I mention it to Spanish people the majority of them have no idea what a "kettle" is. It is especially interesting because in many ways British people could not live without a "kettle".
Having lived in Spain for quite a few years it is obvious why Spanish people don't know the word and the reason is, that (in general) Spanish people don't use "kettles".
So, now you are asking: "What is a kettle?" Well, Spanish people most likely have come across (phrasal verb) one in a hotel room because they are often provided to help you make a cup of tea. The exact translation from the research (investigación) that I have done is: "hervidor (de agua)". Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.