What touches the water matters most.
A kettle can look like stainless steel on the outside while using plastic in the lid, window, filter, seal, or water chamber.
Look inside before you decide.
Inspect the water chamber
Check the base, walls, spout, and any level window that comes into contact with water.
Study the lid and filter
Steam and poured water may reach parts that are easy to overlook in product photos.
Consider daily use
Capacity, cleaning, pouring, and automatic shutoff all matter alongside material choices.
Trace every surface the water touches.
A stainless steel finish does not necessarily mean an all steel water path. We check the parts that contact water, ask what happens when the kettle heats and pours, and note where a manufacturer gives too little detail.
A material description cannot establish that a kettle is safe or unsafe. We document the water path and mark the parts we cannot verify.