Massachusetts Plumbers Journeyman Practice Exam

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What is the maximum temperature allowed for domestic hot water in residential buildings?

110 degrees
120 degrees
130 degrees
140 degrees

The correct answer is: 130 degrees

The maximum temperature allowed for domestic hot water in residential buildings is set to ensure safety and prevent scalding, especially for vulnerable populations such as children and elderly individuals. The recognized standard for the maximum temperature is 120 degrees Fahrenheit. This temperature is deemed safe while still providing comfort for tasks like bathing and washing dishes. Choosing 130 degrees is too high and increases the risk of scalding. The American Society of Plumbing Engineers and various building codes recommend keeping the temperature at or below 120 degrees for the safety of residents. Setting the temperature higher can lead to severe burns, and that’s why regulations are specifically in place to prevent it.