I’ve had lots of opportunities to review plans for pending hydronic heating systems. I’ve also been on “forensic” visits to sites with improperly performing systems. Of the two, I much prefer plan review over forensics. It’s a lot easier to identify and correct issues when they only exist as CAD files or drawings compared to installed hardware in the basement of a disgruntled owner.
Here’s a summary of some of the issues that have shown up on a regular basis.