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I saw stoves with flat glass-like surface and there red glowing circles inside when they're on. Are those a gas stoves? Are there gas stoves with fire inside or those flat stoves are all electric?

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Gas stoves will always have "open" heating elements because the gas requires oxygen in order to burn and generate heat. Anytime you see a closed, glassed-over heating element, the heat is electric in source. However without more information about the design of the stove, it can't really be determined whether the heat is a traditional radiant heat element or an induction element (in which case the red glow may be cosmetic, generated only by lights to indicate that the burner is on).

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    Out of curiosity, have you ever seen induction stoves with cosmetic lights? – rumtscho Dec 23 '19 at 16:38
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    @rumtscho Not personally, but I've talked with other home cooks who've reported seeing them. I don't know if all or even most induction stoves do this but it makes sense as a visual indicator that most stove users would understand intuitively. – logophobe Dec 23 '19 at 16:47
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    Samsung, at least, has had induction burners with LEDs providing a "heating" indicator since 2014: gizmodo.com/… – NothingToSeeHere Dec 24 '19 at 12:54

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