Which of the following best describes the function of a vacuum breaker in heating systems?

• A. To maintain pressure in the heating system
• B. To prevent backflow of fluid
• C. To regulate temperature in the system
• D. To enhance the energy efficiency of the system

Answer: (B)

A vacuum breaker is specifically designed to prevent backflow of fluids within heating systems. Its primary function is to protect the system from the risk of contamination or damage that can occur if water flows backward, which could happen when there is a decrease in pressure. By installing a vacuum breaker, the integrity of the system is maintained, ensuring that the heating water does not flow back into the supply lines or potable water sources, thus safeguarding against contamination.

While maintaining pressure, regulating temperature, and enhancing energy efficiency are important aspects of heating systems, they are not the primary roles of a vacuum breaker. Its unique purpose is aimed at preventing backflow, which is crucial for safe and effective operation in maintaining the overall health of the heating system.