In comparing electric kettles in glass, stainless steel, and plastic, it's essential to consider factors like durability, heat retention, safety, appearance, and maintenance. 

Each material has its advantages and considerations that can influence your choice of an electric kettle.

Here are five key points to consider:

1. Material Durability: Stainless steel kettles are generally more durable and long-lasting compared to glass and plastic kettles. They are resistant to dents, scratches, and corrosion, making them a reliable choice for long-term use.

2. Heat Retention: Glass kettles are known for their excellent heat retention properties. They can maintain water temperature for a longer period compared to stainless steel and plastic kettles, which is beneficial if you need hot water over an extended period.

3. Safety: When it comes to safety, glass and stainless steel kettles are preferable over plastic. Glass and stainless steel do not leach harmful chemicals into the water when heated, ensuring a safer drinking experience.

4. Appearance: Glass kettles offer a stylish and modern look, allowing you to see the water boiling, which can be aesthetically pleasing. Stainless steel kettles also provide a sleek appearance and are often more resistant to fingerprints and smudges compared to plastic kettles.

5. Maintenance: Stainless steel kettles are generally easier to clean and maintain compared to glass and plastic kettles. They are less prone to staining and are dishwasher safe in most cases. Glass kettles may require more careful handling to prevent breakage, while plastic kettles can be prone to discoloration over time.

Consider these points based on your preferences for durability, heat retention, safety, appearance, and maintenance when choosing between glass, stainless steel, and plastic electric kettles.