What should be installed on a boiler to indicate pressure?

A pressure gauge is essential for any boiler system as it provides real-time readings of the internal pressure within the boiler. Monitoring this pressure is crucial for safety and efficiency, as it allows operators to ensure that the boiler is functioning within its designed parameters. If pressure levels rise above safe limits, it can lead to dangerous situations such as boiler failure or explosions. Therefore, having a pressure gauge installed enables timely intervention and maintenance, contributing to the safe operation of the boiler.

The other options serve different purposes. A water level indicator monitors the level of water in the boiler, which is critical for proper operation and preventing damage due to dry firing. A temperature gauge tracks the heat level but does not provide information on system pressure. An oxygen sensor monitors combustion efficiency by measuring the oxygen content in the flue gases, but it does not relate to the pressure within the boiler itself. Each of these components is important, but for indicating pressure specifically, a pressure gauge is indispensable.