System Curves Explained

Understanding the system curve is fundamental to pump selection and HVAC hydronic design. In this video, we break down how a system curve is built from static head and friction head, and how it differs between open and closed systems.

You’ll learn:

• How the system curve is used to find a pump’s actual operating point
• What a system curve is and how it’s plotted (Head vs. Flow)
• The difference between static head and friction head
• How static head (Hs) sets the starting point on the curve
• Why friction losses cause the curve to rise with flow
• How open systems and closed systems affect the static head component

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