Massachusetts Plumbers Journeyman Practice Exam

In buildings where the developed length of hot water piping from the source to the farthest fixture supply exceeds 100 feet, what is the requirement for hot water supply systems?

1. Return circulation is not required

2. Only option 1 is applicable

3. Only option 2 is applicable

4. Both option 1 and option 2

The correct answer is: Both option 1 and option 2

In buildings with a developed length of hot water piping that exceeds 100 feet from the source to the farthest fixture, there are specific requirements to ensure adequate hot water delivery to fixtures. One of the primary concerns in such instances is the potential for significant heat loss along the length of the piping. Implementing both return circulation and insulation for hot water piping is essential in this scenario. Return circulation allows for continuous circulation of hot water back to the source, ensuring that hot water is readily available at the farthest fixtures without delaying service due to cool-down during non-use periods. Additionally, insulating the piping minimizes heat loss, which is particularly important over extended distances. This combination effectively addresses the delays and inefficiencies that arise when the hot water supply exceeds the 100-foot threshold. Therefore, the requirement for hot water supply systems in these situations includes provisions for both options, ensuring that conditions are met for optimal performance and efficiency of the hot water delivery system.