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ryan__fm t1_j0bqaio wrote

Reply to comment by Stopa42 in 5 second toaster and kettle by F1NNTORIO

That's assuming the liter of water is in a kettle-shaped container, right? If a coffee machine can constantly get cold water to very high temperatures very quickly because it's a small amount at a time, wouldn't it be possible to design a kettle so that more of the water's surface area is in contact with the heating elements? So essentially instead of boiling 1 liter of water in a pot, you're boiling something like 1/10 of a liter of water in 10 smaller pots?

edit: I think I get it... I suppose what I'm describing would be possible if you could supply that much power to it that quickly. Coffee machines use a lot of power but over a longer period of time

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jrp55262 t1_j0c1cwb wrote

What you describe is basically an electric tankless water heater. Here are some specs from one manufacturer. The beefiest one they've got requires a 150A electrical connection and it still only raises the input water temperature by 98F; assuming that the incoming cold water is about 55F that gets you up to 153F... which might steep a cup of tea but is still well shy of boiling.

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lewisc1985 t1_j0c2g5i wrote

That’s 98 degree delta at 2.5gpm, mind you. If you lower how many gallons are going through it, it can get much warmer. I have a 18kw unit that can do 70-80 degree delta with three 20 amp breakers at a much lower gpm.

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