On the older hydronic systems, replacing the existing boiler with a new one was pretty straightforward. The installer connected the new boiler to the existing flue, piping and electric. The newer high-efficiency boilers are much different and require some additional planning.

The installation and operation manual is required reading when installing a new boiler. I realize they are long and somewhat boring, but hidden inside the instructions are tips that could mean the difference between a properly working system and one that isn’t. For example, you may discover the manufacturer does not want softened water for the boiler, and the existing system has a working softener connected. That is something you want to know before installing the new boiler.