Buy the Cosori Electric Kettle.

It boils water without the plastic aftertaste and backs itself for three times as long.

What was compared

Cosori Electric Kettle, No Plastic Contact with Water, 1.7L, Black | Wide Opening, Easy to... — $56.99
Chefman Electric Kettle, 1.8L 1500W, Hot Water Boiler, Removable Lid for Easy Cleaning, Au... — $44.95

1. No plastic anywhere water touches, not just BPA-free
Cosori's filter, spout and inner lid are metal or glass, so nothing plastic ever meets your water. Chefman only calls out a steel filter, leaving other contact points unaddressed, so you're trusting a vaguer BPA-free label instead of a full plastic-free build.
2. 3-year warranty beats Chefman's 1-year
Kettles die from scale and heating-element wear, and Cosori backs it for three years, the best in its price range per testing. Chefman gives you one year of cETL assurance, meaning you're on your own two years sooner if it fails.
3. 49,078 buyers rated this, not 13,540
Both sit at 4.5 stars, but Cosori's rating is stress-tested by nearly four times more real owners over more time. That's a far more trustworthy signal than Chefman's smaller, newer sample saying the same thing.
4. A named thermostat beats a mystery one
Cosori uses a Strix thermostat, a component brand known for precise shutoff right at boiling point. Chefman never names its thermostat, so you can't verify it shuts off as cleanly or consistently.
5. Yes, Chefman is $12 cheaper. Ignore it.
Chefman saves you $12 upfront, but Cosori's extra two years of warranty and fully plastic-free build are worth more than that over the kettle's life. Twelve bucks disappears the first time a heating element or lid seal fails a year early.