The best way to resolve an issue is to understand its cause. Electric kettles tend to be made from high-quality steel, while their heating elements usually combine nichrome, nickel, and chromium. Rust generally forms when acidic substances (such as water) come into contact with these metals. It is the result of the steel corroding due to its iron particles coming into contact with oxygen and moisture. As you can imagine, electric kettles create the perfect environment for rust stains to form.