Boilers are well-known for being sturdy heating systems, even when compared to other types like furnaces. This is due to their relative lack of moving parts. The fewer moving parts in a system, the fewer ways for a problem to occur. Boilers do not last forever, though. No matter how well you take care of your boiler system, you will eventually have to replace it. Let’s take a look at some of the signs that your boiler needs to be replaced.