What can result from using contaminated water in a boiler?

Using contaminated water in a boiler can lead to scaling and corrosion, which is the correct answer. When impurities such as minerals, oils, or sediments are present in the water, they can precipitate out under high temperatures and pressures, forming deposits on the boiler's internal surfaces. This process, known as scaling, reduces heat transfer efficiency and can cause overheating of boiler components.

Additionally, corrosion occurs when the contaminants react with the metals in the boiler, compromising the structural integrity and leading to potential leaks or failures. Regular water treatment and testing are essential to prevent these negative effects and maintain the boiler's efficiency and safety.