Which safety device is NOT typically required on a boiler?

In a boiler system, safety devices are critical for preventing dangerous situations. Pressure relief valves, low-water cutoffs, and temperature controls are all essential for maintaining safe operational conditions.

Pressure relief valves serve to release excess pressure from the boiler, preventing potential explosions. Low-water cutoffs are vital for ensuring the boiler does not operate when the water level is too low, which could lead to overheating and damage. Temperature controls help ensure that the water or steam in the boiler does not exceed safe operating temperatures, further safeguarding against accidents.

Heat exchangers, on the other hand, are not typically classified as safety devices. They are components used to transfer heat between two or more fluids without mixing them, playing a role in the boiler's operational efficiency rather than its safety mechanisms. While important to the overall function of heating systems, heat exchangers do not directly prevent hazardous conditions like the other devices listed. This distinction clarifies why they are not considered a required safety device in boilers.