The answer to 'boiler making loud noise' is that a boiler making loud noises is often a sign of an underlying issue that requires attention. Common causes include sediment buildup, worn components, or problems with the pressure relief valve.
Symptoms of a noisy boiler can include banging, rumbling, or whistling sounds. Causes can range from relatively minor problems like a stuck pressure relief valve to more serious issues like a cracked heat exchanger. It's important to address the issue promptly to avoid further damage or safety concerns.