Product Overview
The Pentair WhisperFlo high performance pool pump delivers single-speed circulation for pool and spa systems equipped with three-phase electrical service. This 1 HP Super-Duty model combines a totally enclosed fan-cooled motor with durable thermoplastic construction and Pentair’s FunnelFlo hydraulic design.
Built for demanding circulation applications, it features an oversized strainer basket, a clear inspection lid and 2-inch threaded connections. This is a complete pump assembly—not a replacement motor or variable-speed upgrade.
Ideal For
Commercial pool and spa systems with compatible three-phase power, contractors replacing a matching WhisperFlo pump, and equipment installations requiring single-speed circulation with accessible routine maintenance.
Key Features
- TEFC Super-Duty motor uses a totally enclosed fan-cooled design with commercial-duty square-flange construction.
- FunnelFlo diffuser and impeller help move water while minimizing turbulence and hydraulic noise.
- Engineered thermoplastic housing resists corrosion in pool-equipment environments.
- Oversized strainer basket and clear Cam and Ramp lid simplify debris inspection and basket access.
Benefits
The see-through lid makes it easier to check debris accumulation before opening the pump. A large strainer basket collects leaves and debris ahead of the impeller, while the accessible lid simplifies routine cleaning. Durable housing construction and serviceable components support ongoing equipment maintenance.
Compatibility
Requires compatible 208–230V or 460V three-phase electrical service. It cannot connect directly to a standard 115V or 230V single-phase supply.
For replacement installations, compare the existing pump’s total horsepower, performance curve, plumbing alignment and electrical requirements. Matching nominal horsepower or pipe size alone does not establish replacement compatibility.
Installation Guidance
Pentair specifies installation by a qualified pool-service professional. Your installer must verify electrical connections, grounding, bonding, circuit protection and hydraulic compatibility. The selected pump must meet the circulation requirements of the pool, filter, heater and other connected equipment.
What’s Included
Complete WhisperFlo pump assembly with Super-Duty motor, pump housing, strainer basket and lid.
Confirm Before Ordering
Confirm voltage and electrical phase, existing pump specifications, equipment-pad clearance and required system flow. Review applicable installation requirements and manufacturer warranty coverage for your purchase channel and application.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Pentair |
| Product Family | WhisperFlo |
| Manufacturer Part Number / SKU | 011641 |
| Model | WFK-4 |
| UPC / Barcode | 788379863852 |
| Product Type | High performance pool and spa pump |
| Rated Horsepower | 1 HP |
| Service Factor | 1.65 |
| Total Horsepower | 1.65 THP |
| Operation | Single-speed |
| Electrical Phase | Three-phase |
| Supply Voltage | 208–230/460V |
| Listed Amperage | 4.9A at 208V; 4.5A at 230V; 2.3A at 460V |
| Motor Enclosure | Totally enclosed fan-cooled, Super-Duty |
| Suction Connection | 2-inch NPT |
| Discharge Connection | 2-inch NPT |
| Housing Material | Engineered thermoplastic |
| Strainer Cover | Clear Cam and Ramp lid |
Customer Q&A
Can this replace a 230V single-phase residential pool pump?
Not as a direct electrical replacement. This model requires three-phase power. Your installer must confirm the available electrical service and hydraulic suitability before ordering.
Is this a variable-speed pump?
No. This is a single-speed model, not a WhisperFlo VST. It does not provide onboard variable-speed programming.
Why does a 1 HP pump have a 1.65 THP rating?
Total horsepower equals rated horsepower multiplied by service factor: 1 HP × 1.65 = 1.65 THP. Use total horsepower and performance curves when comparing replacement options.
Do the different amperage ratings indicate multiple speeds?
No. The listed amperage values correspond to different supply voltages. This pump remains a single-speed model.