20美元與300美元電熱水壺：你究竟在為什麼付費？

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同樣是燒開水，電水壺價格從二十元飆到數千元，核心安全機構卻是 70 年前誕生的雙金屬片。工程師跳過測量水溫的思路，利用水沸騰產生的蒸汽觸發機械斷電，不受海拔氣壓影響。高價水壺的價差來自精準控溫、材質細節與外觀設計，部分溢價屬於情緒與社交價值。另外還有冷知識：英國民眾同時燒水泡茶，會造成電網瞬間巨大負荷，國家還要啟用專用電站應對。拆解家電背後的原理與消費邏輯，教你避坑挑選適合自己的電水壺。

Though electric kettles all boil water, their prices range from cheap to thousands‑dollar premium models. Their core safety component is the bimetallic strip invented 70 years ago. Instead of measuring water temperature, engineers use steam from boiling water to trigger mechanical power‑off, which works regardless of altitude and air pressure. Higher‑priced kettles offer precise temperature control, better materials and stylish appearance. Part of the premium pays for emotional and social value. An interesting fact: mass tea‑making in Britain creates huge instant power load, requiring special power stations for grid stability. Uncover the working principle and consumption logic of home appliances, and learn practical tips for picking kettles.

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