Turboboil is a feature offered on a number of Kenmore electric ranges and cooktops. Without you model number it's hard to get into specifics - but turboboil is a special, high wattage heating element that delivers up to 3KW of energy to a specific heater on the cooktop. If I understand correctly, you would only use this setting when you wish to bring water to a boil in the shortest period of time possible - then change to a normal burner heat setting to maintain the temperature of the water in the pot.
Remember, an electric heat element is turned "full on" and "full off" as needed to maintain temperature (unlike a dimmer knob controls a light bulb). The turbo boil turns on a "double heater" to rapidly heat the water - after water reaches 212 degrees, it can not be heated any further (it turns into steam) so you should switch to a normal burner mode from that point forward.
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