What is one sign of a poorly functioning boiler?

A sign of a poorly functioning boiler can manifest as unusual noises, such as banging or popping. These sounds often indicate underlying issues within the boiler system, such as air trapped in the water lines, sediment build-up in the tank, or problems with the heating elements. When the boiler is operating correctly, it should run quietly and efficiently; therefore, the presence of abnormal sounds is typically a warning sign that maintenance or repairs may be necessary to prevent further damage or inefficiency. Monitoring for these types of indicators is essential for maintaining optimal boiler performance and safety.