Pentair WhisperFlo VST 011533 vs EC-011533 Variable Speed Pump: What’s the Difference?
When shopping for a high-performance, energy-efficient pool pump, the Pentair WhisperFlo VST is a standout. But you may notice two nearly identical models: the WhisperFlo VST (011533) and the WhisperFlo VST EC (EC-011533). While these pumps are mechanically the same, there are key differences in availability, pricing, and purchasing restrictions that matter for buyers.
Let’s break down what sets them apart and help you choose the right one for your needs.
Comparison Overview of Each Product
Pentair WhisperFlo VST Variable Speed Pump (011533)
This model is designed for in-store purchase only, per manufacturer restrictions. It cannot be sold online or have prices publicly displayed. It's typically offered by certified Pentair dealers and is ideal for customers who want hands-on service and local installation support.
This version is also part of Pentair's TradeGrade program, which ensures that it is sold and installed by qualified professionals, preserving warranty coverage and performance standards.
- Energy Star® Certified variable speed motor
- Up to 90% energy savings vs single-speed pumps
- Compatible with Pentair automation systems
- Built for quiet operation and long-term reliability
- TradeGrade product: exclusive to brick-and-mortar dealers
Pentair WhisperFlo VST EC Variable Speed Pump (EC-011533)
The EC (eCommerce) version is authorized for online sales. It has the same core features and performance as the standard 011533 model but is available for purchase and pricing online.
- Identical energy efficiency and performance specs
- Available online with transparent pricing
- Quick shipping and wider availability
BONUS OFFER: Get a Free $300 Visa Gift Card with online purchase.
Side-by-Side Comparison
| Feature | WhisperFlo VST (011533) | WhisperFlo VST EC (EC-011533) |
|---|---|---|
| Availability | In-store only | Online and in-store |
| Manufacturer Pricing Rules | No online pricing allowed | Online pricing allowed |
| Performance & Specs | Identical | Identical |
| Energy Efficiency | Up to 90% savings | Up to 90% savings |
| Automation Compatibility | Yes | Yes |
| Warranty* | Available through in-store dealer | Online warranty terms apply |
| Noise Level | Ultra-quiet operation | Ultra-quiet operation |
| TradeGrade Status | Yes (Learn more) | No |
*Warranty terms may vary based on purchase channel; always confirm with the seller.
Pros & Cons of Each Model
WhisperFlo VST (011533)
Pros:
- Sold by authorized local dealers
- Personalized service and professional installation
- Eligible for full Pentair warranty when installed by a pro
- Part of Pentair TradeGrade program
Cons:
- Cannot be purchased online
- No public pricing visibility
WhisperFlo VST EC (EC-011533)
Pros:
- Easily purchased online with full product details
- Same energy efficiency and motor performance
- Often available with quick shipping
- Get a Free $300 Visa Gift Card with online purchase
Cons:
- Warranty may be limited if not professionally installed
- Less direct support compared to local dealer purchase
Which One Is Right for You?
Choose the WhisperFlo VST (011533) if:
- You prefer buying locally and want expert installation
- You want full access to Pentair’s extended warranty options
- You value personalized service from a certified pool pro
Choose the WhisperFlo VST EC (EC-011533) if:
- You prefer the convenience of online shopping
- You want upfront pricing and fast delivery
- You're comfortable with DIY installation or already have a contractor
In the End, It’s the Same Pump — Just Sold Differently
Both versions of the Pentair WhisperFlo VST offer industry-leading energy efficiency, quiet operation, and long-term reliability. The choice comes down to how you prefer to shop and what level of support you need.
Important Note: This comparison between EC and Non-EC models applies to all Pentair TradeGrade products. If you see a product with “EC” in the model number, it is authorized for online sale. Non-EC versions are generally part of the TradeGrade line, meant for in-store purchase only and supported by Pentair’s professional dealer network.
Need help choosing the best variable speed pool pump? Contact us or visit our store locations in Phoenix, Scottsdale, or Las Vegas for expert advice and in-person assistance.
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