I actually tried that button, and all that happened was that the stove started making an ominous beeping sound. Concerned that I had triggered the auto-destruct sequence, I turned it off and waited for my mom to wake up, at which point she was able to teach me the correct usage of the HEATER dial.
well now I know what the dials say! I just pushed the middle one in and turned it on and it boiled water, didn't know there was a special one for that :)
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I think the reason why do we Japanese have "deep fry mode", tempura, is to keep the temperature of cooking oil accurately.