How does a water heater work?

Linh wonders how a water heater works, and Dimitri tries his best to explain it… slowly…

References:

• https://www.billygo.com/blog/four-ways-to-get-instant-hot-water-at-the-faucet/

Errata:

• Recommended temperature for water heater is 140 degrees Fahrenheit (Good job Dimitri!)