Is a plastic kettle safe to use?

The food-grade polypropylene used in kettles is rated for boiling water and is what most kettles use. The usual complaint is taste rather than safety, and it typically fades after the first several boils. Worth knowing: many stainless kettles still have plastic lids, filters and water gauges.

Why it happens

Polypropylene is chosen because it tolerates repeated boiling, is cheap to mould, and conducts heat poorly — which is also why kettle handles are made of it. New vessels release trace volatiles for the first several cycles, which is what people taste as a plastic note.

The marketing term "stainless steel kettle" usually describes the outer shell only. The parts actually in contact with boiling water for the longest — the lid liner, the spout filter, the internal collar, the sight glass — are frequently plastic on those models too.

If you want to avoid hot-water contact with plastic entirely, the honest options are borosilicate glass or an all-metal interior, and both require checking the specification rather than the material named on the front.

What to do about it

1. 1Boil and discard two or three full kettles when the appliance is new.
2. 2Descale regularly — a corroded or heavily scaled element affects taste more than the vessel material does.
3. 3When shopping for a metal-interior kettle, check the lid, filter and gauge specifically. Those are the parts the headline material claim usually excludes.