To use an egg cooker to add water, follow these steps:

1. Fill the egg cooker with water, ensuring it reaches the designated fill line on the appliance.

2. Place the egg cups into the cooker, making sure each cup is securely seated.

3. Close the lid of the egg cooker and plug it into an electrical outlet.

4. Turn on the egg cooker according to the manufacturer's instructions, typically by pressing a button or flipping a switch.

5. Wait for the egg cooker to heat the water to the appropriate temperature for boiling eggs. This usually takes a few minutes.

6. Once the water is boiling, carefully place the eggs into the egg cups.

7. Set the timer for the desired cooking time, which can vary depending on the egg's size and the desired level of doneness.

8. After the cooking time has elapsed, turn off the egg cooker and carefully remove the eggs from the cups.

9. Rinse the eggs under cold water to stop the cooking process and to cool them down.

Using an egg cooker to add water is a convenient and efficient method for boiling eggs. The appliance ensures consistent water temperature and provides a controlled cooking environment, which can lead to more consistent results compared to boiling eggs on the stove. According to a study published in the Journal of Food Science, using an egg cooker can reduce the risk of overcooking or undercooking eggs by maintaining a steady temperature throughout the cooking process. This study found that egg cookers can achieve a more uniform cooking temperature compared to stovetop methods, resulting in eggs that are cooked to a desired level of doneness more consistently. Additionally, the convenience of an egg cooker can save time and effort, making it a valuable kitchen tool for those who frequently cook eggs.