My online research has revealed thus so far:
Most people in their reviews simply complain that the temperature knob could use numbers or at least a chart to go along with it in the manual, but no indications as to what the temperatures are.
One or two reviews say that they used a candy thermometer to figure out the temperatures, and discovered a range such as
Lower White: 130 F, high white, 150F, high green 180F, high white (second white) 200f, all the way (orange) 212F.
I myself, without the use of a thermometer, just my brewed tea and dipping my finger into the water to check the temperature, definitely notice a difference in the temperatures, similar to the range above.
Somewhere else I read that it is kind of a sham, there are only two temperatures, 180 and 212.
This is what Adagio customer support has told me as well,
There are only two temperature options. The gradient does not indicate other
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This product is great but any company that makes something so vague is quite questionable in my book. First off, how did the guy who measured the temperatures at different settings get such a variety of temperatures if there are only two settings? There simply cannot be only two settings, as I most certainly experience different temperatures at different settings. Why in the world, then, is Adagio saying, and basically admitting, that the entire product's subtle marketing is a sham and that there are only two temperatures?
Anyone who knows anything or owns this kettle care to add to this?