Which of the following is a sign of water quality issues in a boiler?

Frequent buildup of scale or sludge in a boiler is a clear indicator of water quality issues. Scale forms when impurities in the water, such as minerals, precipitate out and adhere to the boiler's surfaces. This can significantly reduce heat transfer efficiency, leading to overheating or even damage to the boiler components. Sludge, which is composed of particulate matter and can also accumulate due to poor water treatment or the presence of organic matter, can hinder water flow and cause further operational problems. Maintaining optimal water quality is essential for the efficient operation of a boiler, making the identification of scale or sludge buildup crucial for troubleshooting and preventative maintenance.

In contrast, consistent steam pressure, stable temperature readings, and low fuel consumption are signs of a well-functioning boiler system and do not directly indicate water quality problems.