Glass electric kettles and stovetop kettles each have their own advantages and disadvantages when it comes to energy efficiency. The energy efficiency of a kettle depends on several factors, including the material of the kettle, the heating method, and the amount of water being boiled.

Electric Kettles:

Energy Efficiency: Electric kettles are generally considered more energy-efficient than stovetop kettles because they are designed to be more focused in their heating. They have built-in electric elements that directly heat the water, which means less heat is wasted.

Faster Boiling Time: Electric kettles are known for their rapid boiling times, so they use less energy to bring water to the boiling point compared to stovetop kettles.

Boil Control: Many electric kettles come with features like automatic shut-off, which can prevent over-boiling and save energy.

Stovetop Kettles:

Energy Distribution: Stovetop kettles, depending on the stove type, may have less focused heating since the flames or heating elements on the stovetop spread out and heat the surrounding air as well.

Slower Boiling Time: Stovetop kettles may take longer to bring water to a boil, which can result in slightly higher energy consumption.

Precision Control: Some people prefer stovetop kettles because they allow more control over the heating process, making it easier to achieve specific temperature settings.

Electric kettles are generally more energy-efficient due to their focused heating and faster boiling times. However, the exact energy savings will depend on the specific models of kettles and the frequency of use. If you're concerned about energy efficiency, choosing an electric kettle with a capacity that matches your needs can help reduce waste, as boiling excess water consumes more energy than necessary.