What should be monitored to ensure safe boiler operation?

Monitoring the temperature and pressure indicators is essential for safe boiler operation. These indicators provide vital information about the boiler's operating conditions. The temperature helps ensure that the water is heated to the appropriate level for efficient steam production, while pressure indicators show whether the system is operating within safe pressure ranges. Too high or too low temperature and pressure can lead to inefficiencies and, more critically, safety hazards such as explosions or boiler failure.

In contrast, focusing solely on fuel levels, the boiler's physical appearance, or even the color of the boiler paint does not provide a comprehensive overview of the operational safety. Fuel levels are important, but they do not account for the critical operational parameters that directly influence the safety and efficiency of the boiler. Similarly, while physical appearance and paint color can indicate maintenance needs or possible corrosion, they are not direct indicators of the boiler's operational state, temperature, and pressure, making them less relevant for ensuring safe operation.