system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why shouldn't you put hot water from a tap into your kettle to boil?
gpt
Hot water heaters hold water for long periods of time, and as such they often have buildup of various sediments and other contaminants that you really don't want to be ingesting on a regular basis.

Also, it fouls the flavor of the water. Especially if you have scale issues.

Take two cups. Fill one with hot water, fill another with cold. Put them both in the fridge.

Once the hot water is cold, taste both cups. You'll see that the taste of the hot water is not nearly as good as the cold.