How does gas water heater work?
Herein, how does a hot water heater work?
An electric water heater works essentially the same way as a gas water heater. It brings cold water in through the dip tube (1) and heats it using the electric heating elements (2) inside of the tank. The hot water rises in the tank and is moved throughout the home through the heat-out pipe (3).
In this regard, how does a gas water heater work without electricity?
If you have a conventional tank-style water heater powered by electricity, your water heater will stop heating water in the event of a power outage. However, water that has already been heated up to the point when the power goes out will remain hot for some time while stored in the insulated tank.
Almost all water heaters have been made the same way for the past 60 years. They construct a steel tank, then bond vitreous glass to the inside of it to keep it from rusting. To protect that steel, the makers install sacrificial anode rods in the tanks.