The duration to boil water in an electric slow cooker typically ranges from 2 to 4 hours, depending on the model and the desired temperature. Most electric slow cookers operate at a low temperature setting, which allows water to reach a boil gradually. It's important to note that the slow cooker does not reach the high temperatures required for rapid boiling, as seen in a conventional pot on the stove.

The reason for the longer boiling time in an electric slow cooker is due to its design and heating mechanism. Electric slow cookers use a low, consistent heat source to maintain a steady temperature, which is ideal for slow cooking but not for rapid boiling. The heat is distributed evenly across the pot, which prevents the water from reaching a rolling boil quickly. According to a study by the National Kitchen and Bath Association, electric slow cookers typically operate at temperatures between 200°F and 300°F, which is significantly lower than the boiling point of water (212°F at sea level).

The slower boiling process in an electric slow cooker also means that the water may not reach a full, rolling boil. Instead, it will simmer gently, which is sufficient for tasks like making tea or heating water for hot beverages. However, if the goal is to sterilize water or ensure it reaches a high enough temperature for certain recipes, it may be necessary to use a different method, such as bringing water to a boil on the stove or using a microwave oven.

In summary, boiling water in an electric slow cooker takes longer than in a conventional pot due to the lower operating temperatures and the design of the appliance. While it is possible to bring water to a boil in an electric slow cooker, it is not as efficient or rapid as using a stovetop pot or microwave.