Rhode Island Journeyman Plumber Practice Exam

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What is the maximum temperature for a hot water heater?

200 degrees
210 degrees
220 degrees
240 degrees

The correct answer is: 210 degrees

The correct maximum temperature for a hot water heater is 210 degrees Fahrenheit. This temperature is a standard guideline for many residential hot water heating systems, as it helps to prevent the growth of harmful bacteria, such as Legionella, which can thrive in water temperatures below 140 degrees Fahrenheit. Setting the temperature too high can create a risk of scalding injuries, especially for children and elderly individuals, which is why many safety codes and best practices recommend not exceeding this limit. While some might consider higher temperatures for specific applications, 210 degrees is often seen as a practical balance between sanitation and safety in household environments. The other temperature options may exceed safety recommendations or codes designed to protect users, making them less appropriate for standard residential use.