Grundfos SCALA1 5-55 Booster Pump

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The Grundfos SCALA1 5‑55 is a high‑performance, all‑in‑one, self‑priming booster pump designed to deliver strong, reliable water pressure for domestic and light‑commercial applications. With powerful boosting capability, quiet operation, and smart connectivity, the SCALA1 5‑55 ensures consistent water supply wherever you need it.

High‑Performance Water Boosting

Built to handle more demanding installations, the SCALA1 5‑55 offers:

  • Maximum head up to 182 ft (55 m) for high‑pressure delivery
  • Nominal flow of 23.3 US GPM (5.3 m³/h) for strong, steady water output

This makes it ideal for larger homes, multi‑tap use, and light commercial setups.

Product Number: 99631754

Features and Benefits

All‑In‑One Design

The pump combines all essential components into a single compact unit, including:

  • Electric motor
  • Diaphragm pressure tank
  • Pressure and flow sensors
  • Controller and non‑return valve
  • Dry‑running protection

This streamlined design minimizes installation time and eliminates the need for external accessories.

Smart Connectivity & Control

With built‑in Bluetooth® technology, SCALA1 5‑55 connects directly to the Grundfos GO app, allowing you to:

  • Configure advanced settings
  • Monitor real‑time performance
  • Diagnose alarms
  • Create and share pump reports

The pump can be fully customized for different water‑supply setups with simple, intuitive controls.

Fast, Easy Installation

SCALA1 pumps are designed for simple 3‑step setup—connect the pipework, prime the pump, plug it in—and the system is ready to run. Advanced adjustments can be handled via the app for tailored performance.

Low‑Noise Operation

Operating at under 55 dB(A)—similar to a modern dishwasher—the SCALA1 5‑55 is quiet enough for installation in or near living spaces.

Rugged and Reliable

  • Indoor/outdoor rating: IPX4D, suitable for most environments
  • Max liquid temperature: 113°F (45°C)
  • Max ambient temperature: 131°F (55°C)
  • Maximum system pressure: 115 psi (8 bar)

 

Twin‑Pump Capable

For installations requiring additional flow or redundancy, the SCALA1 5‑55 can be paired with another pump using the SCALA1 Twin Accessory Kit, enabling duty/assist or duty/standby operation.

Specifications

Technical

Rated flow 22 US gpm
Rated head 101.7 ft
Maximum head 180.5 ft
Primary shaft seal BVBP
Approvals CSA,cULus,CCSAUS,CSA LLC,PROP6
Approvals for drinking water CSA DW
Start pressure 40.61 psi

Materials

Pump housing Composite
Impeller Composite

Installation

Range of ambient temperature 32 .. 131 °F
Maximum operating pressure 116.03 psi
Maximum permissible inlet pressure 29.01 psi
Type of inlet connection NPT(M)
Type of outlet connection NPT(M)
Size of suction port 1 inch
Size of outlet port 1 inch
Pressure rating for connection PN 8

Liquid

Pumped liquid Water
Liquid temperature range 32 .. 113 °F
Selected liquid temperature 68 °F
Density 62.29 lb/ft³

Electrical data

Max. P1 1250 W
Rated power - P2  1.15 HP
Main frequency 60 Hz
Rated voltage 1 x 115 V
Rated current 11.6 A
Enclosure class (IEC 34-5) X4D
Insulation class (IEC 85) F
Length of power cable 4.92 ft
Power plug Type B (NEMA 5-15), US plug 115V

Others

Net weight 30.9 lb
Gross weight 35.3 lb
Shipping volume 1.62 ft³
Storage temperature range -40 .. 158 °F


Downloads

SCALA Data Booklet

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Grundfos SCALA1 5-55 Booster Pump
Grundfos SCALA1 5-55 Booster Pump
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