I'm a new owner of a slightly used Kenmore Elite 9991 Induction range. I've had it for about a month and am generally very happy with it, save a few minor quibbles, namely the burner layout, and the touchpad controls (I'd prefer a knob frankly).
I purchased the unit from the Sears outlet at a significant discount from the new price, and while it was sold as "new", I'm pretty sure it was a return or a tester, and that they were able to sell it as "new" under some loophole because they're also the manufacturer.
The induction cooktop has 4 burners or hobs or "work elements" as the repairman that just left called them. The specs on each from the Sears site are as follows:
Large:1-10in. 2,500/3,400 watts PowerBoost
Large:1-8in. 2,400/3,400 watts PowerBoost
Standard: 1-6in. 1,500/1,900 watts PowerBoost
Standard:1-7in. 1,900/2,600 watts PowerBoost
Each element has 2 rings to specify minimum and maximum pan size. On the 8" & 10" elements the minimum ring is 6" in diameter, whereas the max ring is (obviously) 8" and 10" in respectively.
I did the following test. I took a 6" pan (min size for both elements) and heated 1 cup of water to boil from a cold start on max power on each element. Strangely, the 8" element heats the water nearly twice as fast as the 10" element. Thinking the unit was broken, I called the sears tech out and showed him my test and he said that nothing was wrong, the 10" element has a bigger "work element" under neath it and that I needed to use a bigger pan.
Up to this point I thought the biggest circle was the most powerful element, now I'm not so sure. The same energy is being delivered to a larger coil on the 10" element than the 8" one, therefore the 10" is actually less powerful per sq inch of cook surface? Does this seem right to you guys or is my range broken?