To differentiate a steam boiler from a water boiler, which feature is commonly used?

To differentiate a steam boiler from a water boiler, which feature is commonly used?

• A. Vent type
• B. Boiler trim
• C. Fuel source
• D. Pressure gauge size

Answer: (B)

The feature used to tell a steam boiler from a water (hot water) boiler is the boiler trim—the collection of control and safety devices installed on the boiler. Steam boilers are built to produce and manage steam at higher pressures, so their trim is configured with steam-specific components such as a steam pressure gauge, steam stop valves, and appropriate safety relief devices and feedwater controls. In contrast, hot water boilers are designed to circulate heated water at lower pressures, so their trim includes devices tailored to hot-water operation, like aquastats and fittings for hot-water circuits. Because trim reflects the intended service and operating conditions, it provides a practical, reliable way to distinguish the two types in the field. Vent type, fuel source, and gauge size can vary for reasons unrelated to whether the system is steam or hot water, so they’re not as definitive for differentiation.

The feature used to tell a steam boiler from a water (hot water) boiler is the boiler trim—the collection of control and safety devices installed on the boiler. Steam boilers are built to produce and manage steam at higher pressures, so their trim is configured with steam-specific components such as a steam pressure gauge, steam stop valves, and appropriate safety relief devices and feedwater controls. In contrast, hot water boilers are designed to circulate heated water at lower pressures, so their trim includes devices tailored to hot-water operation, like aquastats and fittings for hot-water circuits.

Because trim reflects the intended service and operating conditions, it provides a practical, reliable way to distinguish the two types in the field. Vent type, fuel source, and gauge size can vary for reasons unrelated to whether the system is steam or hot water, so they’re not as definitive for differentiation.