Ever noticed water pressure building up in a closed plumbing system even when no fixtures are running? In this episode of Caleffi’s 5 Things You Need To Know series, we break down the root causes behind plumbing pressure creep and how to properly diagnose and prevent it.

In this video, you’ll learn:

• What thermal expansion is and how it impacts system pressure
• How backflow preventers and check valves turn open systems into closed loops
• The role of pressure-reducing valves (PRVs) and why they fail or allow pressure creep
• How to size and install thermal expansion tanks correctly
• Quick troubleshooting steps to diagnose thermal creep vs. mechanical PRV failure