For water heating specifically, get an electric kettle. They are optimized for boiling water, much faster than gas OR induction on a stove.
Induction power is still limited by pot diameter and common cookware is very heavy for water boiling because other types of cooking need more even heat and higher temperatures.
I actually raced a 120v kettle versus and high-end induction stove to boil 1l and it was very close.
Electric kettles are very well optimized for speed and efficiency.