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Wall Series Water Pressure Booster Pumps

OUTDOOR / ROOFTOP Water Booster Pumps

Designed for outdoor use in warm climate areas

Compact, powerful, and engineered for performance

Can't find what your looking for? Email us at This email address is being protected from spambots. You need JavaScript enabled to view it. or call 603-626-7371 Monday through Friday, 8 AM to 4 PM (EST).

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Manufacturer: Towle Whitney
Product Code: TW1111
Availability: In Stock

Product Overview:

The TW1111 Series booster pump system is engineered specifically for outdoor applications in warm climate regions. Constructed with stainless steel centrifugal pumps and mounted on a rugged, powder-coated 12-gauge steel strut, this system is designed for durability and structural integrity. Each unit includes NEMA 4X-rated variable frequency drives, offering reliable protection against rain and sun exposure (note: not rated for freezing conditions).

Installation Manuals

Available Models

* Standard Pump Options:

Choose the model that best suits your needs and press Add to Quote to request pricing. For Model Specifications, scroll down to Submittals below.
GPM And Boost MAX PER PUMP

SelectModelHPCommon Design PointsSubmittal
TW1111-2T-3K1/2 HP15 GPM @ 45 PSI Boost Not Available
TW1111-2T-4K1/2 HP15 GPM @ 60 PSI Boost Not Available
TW1111-2T-5K3/4 HP15 GPM @ 70 PSI Boost Not Available
TW1111-2T-6K3/4 HP15 GPM @ 80 PSI Boost Not Available
TW1111-4T-3K3/4 HP35 GPM @ 40 PSI Boost Not Available
TW1111-4T-4K1 HP36 GPM @ 60 PSI Boost Not Available
TW1111-4T-5K1.5 HP36 GPM @ 70 PSI Boost Not Available
TW1111-4T-6K2 HP36 GPM @ 100 PSI Boost Not Available
TW1111-8T-2.5K1 HP50 GPM @ 35 PSI Boost Not Available
TW1111-8T-2K3/4 HP50 GPM @ 30 PSI Boost Not Available

Common design points are examples of typlical applications. Actual performance depends on incoming pressure,
desired set pressure, flow requirements, piping conditions, and system demand.

Call Us

Not sure which Outdoor / Rooftop Water Booster Pump is right for your application?

If you do not see what you are looking for, additional models and custom configurations are
available to meet your needs.

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TW1111 Series – Built for Outdoor Performance in Warm Climates

 Data centers require precision — and that's exactly what our booster systems deliver. Downtime isn’t an option — and poor water flow can lead to thermal shutdowns or degraded server performance. With Towle-Whitney’s data center pump solutions, you’re protected by a system designed to keep cooling operations running smoothly, regardless of demand spikes or equipment cycling.

  • High-Performance Pumps: Utilizes cast iron and stainless steel centrifugal pumps for durability and efficiency.
  • Variable Frequency Drives (VFDs): Equipped with UL508-rated VFDs that adjust pump operation to maintain constant pressure, optimizing energy consumption.
  • Modular Design: Built on a painted steel frame that allows for easy transportation and installation, even in tight spaces.
  • Lead-Lag Operation: Programmable VFDs alternate lead pumps every 24 hours, ensuring even wear and extended system life.
  • Plug-and-Play Installation: Systems come pre-wired and factory-tested, reducing on-site labor and commissioning time.
  • Expansion Tank Included: Each system includes a properly sized expansion tank to accommodate system pressure changes.

Specification Sheets (Submittals)
Model TW1111-20R-40.pdf
Model TW1111-10R-65.pdf
Model TW1111-15R-40.pdf
Model TW1111-15R-50.pdf
Model TW1111-15R-60.pdf

In an effort to provide the highest level of customer service we offer a limited three warranty on all of these water booster pump models. All of the model specific data sheets have a page dedicated to discussing the warranty, but don’t hesitate to reach out with additional questions.

towle whitney warranty pdf

Specifications
HP 7.5 - 15
GPM 100 - 360
PSI Boost 85 - 100

About the Outdoor / Rooftop Water Booster Pump Series

TW1111 Outdoor / Rooftop Water Booster Pump systems are designed to provide dependable, efficient pressure boosting with factory-built controls, compact installation, and simplified service.

Operation

Lead, Lag, and Alternate Operation

Balanced run time extends equipment life and improves reliability.
Factory Tested

Prewired and Factory Tested

Every system is built, tested, and inspected before shipment.
UL508 Rated VFDs

UL508 Rated VFDs

High-quality variable frequency drives for efficient, code-compliant operation.
Easy Installation

Modular Frame for Easy Installation

Compact footprint and modular design simplify transport and on-site setup.
Plug-and-Play Installation

Plug-and-Play Installation

Quick electrical and piping connections for faster start-up.
Options

BACnet, Modbus, and EtherNet/IP Options

Seamless integration with building automation systems.


Related Products

Standard Duplex Booster System
Creative design for cost savings 29″ wide x 36″ deep

Standard Duplex Booster System

Options available: NEMA 4X, BACnet modules, Modbus TCP/IP Modules, EtherNet/IP Modules, and more.
COMPACT DUPLEX Booster System
The unique over/under frame allows installation of booster systems in TIGHT SPACES

COMPACT DUPLEX Booster System

At 16″ wide and 34″ deep, the COMPACT SERIES will fit into hallways, corners, and under stairwells. For other sizes, please call the factory.

We Provide Products All Across The USA

Call Now: 800-807-9827

We have clients in the following areas, but service the entire United States!

  • Texas
  • New York
  • California
  • Florida
  • Pennsylvania
  • Illinois
  • Ohio
  • North Carolina
  • Massachusetts
  • Georgia
  • Virginia
  • Tennessee
  • Washington
  • Michigan
  • Arizona