Is it true that fuel gas is ignited at the bottom of a water heater storage tank?

The statement is true because in many traditional water heater designs, especially those that utilize gas as a heat source, the fuel gas is ignited at the bottom of the storage tank. This design allows the heat generated from the combustion of the gas to rise and warm the water in the tank efficiently.

In these systems, the burner is typically located at the base of the tank to provide direct heating to the water. As the burner ignites fuel gas and produces flame, the heat transfers upward, facilitating the heating process and promoting a more uniform water temperature throughout the tank.

This design principle is common in both tank-type gas water heaters and some types of boilers, making it a fundamental understanding for those working with fuel gas systems.