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Joined 2 年前
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Cake day: 2023年8月9日

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  • You get 3-phase in the US if you live in a large apartment complex. Especially if it has an elevator. Since this combines to get 208V, the math works out to making your 240V stove only 75% of what it should be.

    For residential use, split phase is fine. We just run the two legs to get 240V on the specific things that need it. That’s generally electric stoves, water heaters, AC unit, electric dryer, and more recently, EV chargers. 3-phase is great when you’re driving something that spins with a high draw, and of those, only the AC unit does that (electric dryers spend most of their electricity heating, not spinning).



  • Have to drop the US number by 20% for continuous loads like a kettle would be.

    That said, US homes built in the last 40 years or so tend to have a lot of separate circuits in the kitchen. My house has one for the fridge, one for the disposal, one for the dishwasher, one for the lights that’s shared with lights in adjacent areas, stove has its own 240V outlet, and then one for all the other plugs. If I ran the microwave and a kettle and a mixer all at once, I’d probably still trip it, but that’s a lot of multitasking going on.



  • Microwave magnetron efficiency is around 65%. Since a kettle turns electricity directly into heat, it’s basically 100% efficient.

    A caveat is that microwaves will heat water directly and won’t lose as much to its surroundings. This is similar to why induction stoves are more efficient; they’re less efficient on paper than direct electric heating or burning gas, but they heat the thing you want in a more direct way.

    Even so, a microwave isn’t great for this task. If you’re short on space and don’t want even a small travel kettle, I can see why you’d take this option. Otherwise, no.