What Is a Constant Pressure Well System? | Deep Dive Plumbing Maryland
Well Systems
What Is a Constant Pressure Well System?
A constant pressure well system uses a variable-speed pump motor — controlled by a drive unit like the Grundfos CU301 or CU302 — that continuously adjusts speed to maintain steady pressure (typically 60 PSI) regardless of how many fixtures are running simultaneously. Unlike a standard pump that cycles on and off, it modulates in real time.
Standard Pump vs. Constant Pressure
| Feature | Standard Pump | Constant Pressure |
|---|---|---|
| Pressure range | 40–60 PSI (swings) | 60 PSI (steady) |
| Motor speed | Fixed on/off | Variable — adjusts to demand |
| Pump cycling | Frequent | Minimal — extends pump life |
| Multi-fixture performance | Pressure drops | No pressure drop |
| Low-yield well friendly | No | Yes — draws water slowly |
| Energy use | Full power each cycle | Only what demand requires |
Who Benefits Most
Homes with 3+ bathrooms running simultaneously
Properties with irrigation systems or outdoor spigots
Low-yield wells (draws water slowly to avoid running dry)
Homes where pressure drops when the shower and dishwasher run at the same time
Anyone replacing a pump — upgrade cost is modest at that point
Cost in Maryland
Installation cost varies depending on well depth and whether a new pressure tank is needed. Many homeowners recoup the cost through fewer pump replacements and lower energy bills. Call for a free estimate.
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