What component is typically connected to the steam coil flange on a steam-heated domestic hot water tank?

• A. A water sensor
• B. A thermocouple
• C. A vacuum breaker
• D. A pressure switch

Answer: (C)

The steam coil flange on a steam-heated domestic hot water tank typically connects to a vacuum breaker. The purpose of the vacuum breaker is to prevent the formation of a vacuum within the hot water tank that could occur when the water cools and contracts. This vacuum could lead to structural damage to the tank or impede the proper operation of the heating system. By allowing air to enter as the water is drawn from the tank and helping to maintain atmospheric pressure, the vacuum breaker ensures that the system operates safely and efficiently. This installation is crucial for maintaining the integrity of the tank and ensuring a continuous supply of hot water.

While other components like water sensors, thermocouples, and pressure switches play important roles in monitoring and controlling various aspects of heating systems, they do not fulfill the specific function of preventing vacuum formation within a hot water tank.