🔍 Key Concepts

• Function of a gauge glass on any boiler (what does it actually indicate?) • Basic layout of a coil-type auxiliary boiler and where water/steam is collected or stored • Difference between a water treatment device and a pressure/water level vessel

💭 Think About

• Ask yourself: The gauge glass must show the level of what fluid, in what part of the system? Trace where that fluid actually sits in a coil-type boiler. • Look at each option and decide: Is this a place where water level needs to be directly observed, or is it only a flow path/treatment device? • Which component in a coil-type boiler acts like a small drum or chamber where water/steam is separated or collected, and therefore needs a gauge glass?

✅ Before You Answer

• Be clear on what a gauge glass measures (pressure, temperature, or level?). • Identify which option is a vessel or chamber where level exists, versus simple piping or conditioning equipment. • Verify which component in a coil-type system is specifically provided with water level indication for safe operation.