What would be the best method for raising the boiling point of water in a kettle by a few degrees Celsius?

Question

Quizplus · Accepted Answer

Adding table salt (or any non-volatile solute) to water increases its boiling point through a phenomenon known as boiling point elevation. This is a colligative property, meaning it depends on the number of solute particles in the solution rather than their identity. Increasing the temperature of the stove would only make the water reach its boiling point faster but wouldn't change the boiling point itself. Increasing the surface area by transferring the water to a larger kettle would also not affect the boiling point; it would potentially increase the rate of evaporation at temperatures below the boiling point.

What Would Be the Best Method for Raising the Boiling