Part 5/9:
When hot water is drawn from the system, the cold water gradually raises the cold/hot boundary up within the tank. The lower heating element activates when this boundary reaches its point, heating the cold water that fills the tank. This unique approach allows the water heater to capitalize on its design, efficiently utilizing its power to sustain adequate hot water supply.
The efficiency is further exemplified when the upper heating element engages. As soon as cold water enters the tank, the upper element is tasked with heating the already tepid water that’s pooled at the top, thus providing quicker access to hot water once the lower element has warmed the water around it.