What does a heat shield primarily prevent in a water heater system?

A heat shield in a water heater system is specifically designed to prevent flame rollout, which is when flames escape the combustion chamber of the unit and can cause serious safety hazards, including potential fires. The shield helps to contain the flames and direct heat within the desired areas, ensuring that the combustion process occurs safely and efficiently. This is particularly important in gas water heaters, where improper containment of flames can lead to dangerous situations.

In addition to safeguarding combustion, a heat shield can also play a role in protecting other components of the water heater from excessive heat exposure. However, its primary function remains centered on preventing hazardous flame distribution. This makes it a crucial safety feature in maintaining the integrity of the water heater's operation and protecting surrounding areas from fire risks.