Do Electric Kettles Have Microplastics? What the 2025 Study Found

An electric kettle looks harmless, but think about what it actually does: it holds water and heats it to nearly 100°C, over and over, every single day. If the inside of that kettle is plastic — and most budget kettles use a polypropylene body, lid, or water window — then you're repeatedly pressing near-boiling water against a plastic surface. Heat is exactly the condition that makes plastic shed fastest, which is why the kettle has become one of the most-scrutinized appliances in the kitchen.

In 2025, researchers finally put a number on it. The picture is consistent with what we already know about heat and plastic: the hotter the water, the more particles come loose from the plastic. This guide walks through what the study found, whether the amounts are worth worrying about (the honest answer is calmer than the headlines), and the simple kettle swaps that remove the problem at the source.

Do electric kettles have microplastics?

If the kettle has plastic parts in contact with the hot water, yes. In 2025 a team publishing in npj Emerging Contaminants tested polypropylene plastic kettles — the standard material for the body, lid, and water windows of budget models — and confirmed with multiple analytical methods that boiling water pulls both nanoplastics and microplastics off the plastic surface. The first boil in a new kettle released roughly 12 million nanoparticles per milliliter, which works out to about 3 billion particles in a single 250 ml cup.

That number drops off quickly — the biggest burst comes from a brand-new kettle — but it never reaches zero. Even after hundreds of boils, the researchers still measured on the order of 205 million particles per cup. The particles are polypropylene, the same plastic the kettle is made of, and they end up in whatever you pour: your tea, your coffee, your instant oatmeal. It's a close cousin of what happens when you microwave food in plastic — heat plus a plastic surface equals shedding.

How does boiling water pull plastic out of a kettle?

Heat does the work. A 40-55 word answer: when water approaches boiling, the near-100°C temperature physically works microscopic fragments loose from the polypropylene surface — it's mechanical shedding, not a chemical reaction. In the 2025 tests, particle release climbed steeply as the water temperature rose toward boiling, which is exactly why a kettle sheds far more than the same plastic holding a cold drink.

This matters because a kettle is the perfect storm for shedding: maximum heat, applied to a plastic surface, repeated multiple times a day. A cold plastic bottle sheds slowly; a plastic kettle at a rolling boil sheds fast. The good news is that the reverse is also true — take the plastic out of the hot-water path, and the mechanism has nothing to act on. That's the whole case for a glass or stainless-steel kettle.

Does a new kettle shed more than an old one — and does hard water help?

Both effects showed up clearly in the research. A brand-new kettle sheds the most, because the freshly-molded plastic surface has loose material and manufacturing residue ready to come off; the release then tapers with use. That's why some manufacturers already tell you to boil and discard the water a few times before first use — it clears the worst of the initial burst.

Hard water helps too, in a way that's almost poetic: the minerals in real tap water gradually form a thin layer of scale inside the kettle, and that scale acts as a barrier between the water and the plastic. In the 2025 work, after about 40 days this mineral film cut microplastic release by more than 89% compared with deionized water. So the limescale you've been scrubbing off is partly protecting you — though a glass or steel kettle is a far more reliable fix than relying on scale build-up.

Kettle Type	Plastic in Hot-Water Path	Notes
Plastic (polypropylene) kettle	High	Body/lid/window shed most when new and every boil; the design to skip
"Stainless" kettle with plastic lid or window	Moderate	Steel body helps, but hot water still touches plastic parts — check the lid and spout
Glass kettle	Low	Borosilicate body; only a small closure gasket remains, not the water path
All-stainless kettle	Lowest	Steel interior, lid, and spout — no polypropylene surface to shed

Are the microplastics from a kettle dangerous?

Here's where honesty matters. The particle counts are real and large, but the study measured how much plastic is released — not what those particles do once you swallow them. On the specific question of harm from kettle-shed microplastics, the science doesn't have an answer yet, and no one should read a health verdict into numbers that weren't designed to give one.

What we do know is broader: microplastics are increasingly detected throughout the human body, and researchers are still working out what that means. Against that backdrop, the reasonable stance is proportion — not panic. But the kettle is unusual among plastic sources in one respect: it's cheap and permanent to fix. You don't have to prove the particles are harmful to decide that a glass kettle, which sheds nothing into your tea, is the better default.

How do you stop your kettle from adding microplastics?

Two moves cover it. First, take the plastic out of the boil: choose a kettle where hot water only ever touches glass or stainless steel — and check the details, because plenty of "stainless" kettles still have a plastic lid, sight window, or spout. Our full guide ranks the best non-toxic electric kettles on exactly this.

Second, clean up the water you're boiling. Boiling doesn't remove the microplastics already in your tap water — see our explainer on whether boiling water removes microplastics — so filter first. A pitcher that carries a specific microplastics claim (ideally NSF/ANSI P473 certification) cuts particle counts sharply; see the best water filter pitchers for microplastics and the broader water filter roundup. Filter, then boil in glass or steel, and you've closed both gaps. The picks below are the simplest, longest-lasting way to do it.

---

The best glass and stainless-steel kettles (and filters) to cut microplastics

The fix for a shedding kettle is a kettle with no plastic in the water path — plus a filter for the water you pour into it. Every product below is a real, currently-sold model: three glass or all-stainless kettles that keep boiling water off plastic, two certified microplastic-reducing filters, and a steel bottle to carry your tea without going back to plastic. Prices and availability change, so check current listings.

1. OXO Brew Cordless Glass Electric Kettle — Best Overall

Because the kettle is where the heat meets the plastic, replacing it removes the problem at the source — and a glass kettle is the most reassuring way to do it, since you can literally see that nothing plastic touches the water. The OXO Brew pairs a borosilicate-glass body with a brushed-stainless lid and spout, so the entire hot-water path is glass and steel.

2. Secura Stainless Steel Double-Wall Electric Kettle — Best All-Stainless

If you'd rather not risk a glass kettle in a busy kitchen, the Secura is the all-metal answer: a 304-stainless interior with no plastic water window, wrapped in a double wall that stays cool to the touch. It's the most durable pick here, and it keeps boiling water on nothing but food-grade steel.

3. COSORI Gooseneck Electric Kettle — Best for Tea & Pour-Over

Serious tea and coffee drinkers want temperature control and a controlled pour — and the COSORI delivers both on a stainless water path. The gooseneck spout makes it a favorite for pour-over, the presets let you match the heat to the leaf, and because the inner lid, body, and spout are steel, none of that precision comes at the cost of plastic in the boil.

4. Epic Pure Water Filter Pitcher — Best Water Filter

A better kettle stops your appliance from adding plastic; a filter cleans up what's already in the water. Because boiling doesn't remove microplastics on its own, filtering first is the other half of the fix. The Epic Pure is the clearest choice: its dual-stage design uses a hollow fiber membrane as the primary microplastic barrier, and Epic publishes the independent lab results to back the 99.9% removal claim.

5. Waterdrop Chubby 10-Cup Pitcher — Best Certification (NSF P473)

If you want the one credential that proves a filter is rated for microplastics, the Waterdrop Chubby has it: formal NSF/ANSI P473 certification, plus the longest filter life on the market at 200 gallons (about 4–5 months for most households). Filter your water with this, then boil it in a glass or steel kettle, and you've closed both gaps at once.

6. Klean Kanteen Classic 27oz — Best for Tea On the Go

---

The honest verdict

Do electric kettles have microplastics? If yours has plastic in the water path, yes — the 2025 npj Emerging Contaminants study measured about 3 billion nano- and microplastic particles in a single cup from a new polypropylene kettle's first boil, dropping to roughly 205 million per cup after hundreds of boils but never reaching zero. Heat drives it, new kettles shed the most, and hard-water scale slows it down. That part is real. But the study measured how much plastic is released, not what it does to you — so the accurate takeaway is proportion, not alarm.

What makes the kettle different from most plastic worries is how cheap and permanent the fix is. A one-time swap to a glass or all-stainless kettle takes plastic out of your daily boil for good, and filtering the water first cleans up what your tap already carries. You don't have to prove the particles are harmful to decide that a glass kettle — which sheds nothing into your tea — is simply the better default.

---