Rhode Island Journeyman Plumber Practice Exam 2026 - Free Journeyman Plumber Practice Questions and Study Guide

The maximum allowable hot water setting for shower and tub/shower valves is indeed established at 120 degrees Fahrenheit. This standard is in place primarily for safety reasons, as temperatures above this threshold can lead to severe burns, particularly in vulnerable populations such as children and the elderly.

In many building codes and plumbing regulations, the 120-degree limit is emphasized to ensure that hot water delivered through fixtures is safe for users. It also encourages the use of anti-scald devices in the plumbing system which can automatically reduce the temperature of water if it exceeds this level.

By setting this limit, the intention is to balance comfort with safety, preventing potential scalding incidents that can occur with excessively hot water. It's important for plumbers and anyone involved in building or renovation to adhere to these standards to protect the health and well-being of all occupants in a building.