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Grundfos SCALA1 5-55 — 99631739 Water Booster Pump 230V

by Grundfos
SKU 99631739
$ 991.42 - $ 991.42
$ 991.42
$ 991.42 - $ 991.42
$ 991.42

Grundfos SCALA1 5-55 (99631739) — All-in-One High Head Booster Pump

The Grundfos SCALA1 5-55 is a powerful, compact booster pump system combining pump, motor, control, sensor, and tank into a single unit. Designed to deliver higher head and stronger flow, this variant suits homes or systems with tougher pressure needs. Its built-in smart diagnostics and Bluetooth connectivity add ease and control to your installation.

Key Features & Benefits

  • Integrated all-in-one design — no external control or parts
  • High-output variant: up to 5–55 GPM and increased head capacity
  • Self-priming capability for tank-to-home use
  • Bluetooth support for monitoring and configuration via Grundfos GO app
  • Smart protection: dry-run, overload, diagnostics, and auto safeguard modes
  • Quiet operation and sealed design (IP6X) — no exposed electronics

Applications

  • Pressure boosting in multi-story homes or challenging plumbing layouts
  • Overcoming low city water pressure
  • Tank-fed systems or rainwater boosting
  • Small irrigation or landscape circuits with higher elevation lift

Specifications

Model / Variant SCALA1 5-55 (99631739)
Flow Capacity 5 – 55 GPM (range varies by system conditions)
Max Head ~ 180 ft (55 m) (consult variant curves)
Voltage / Phase 230 V, Single Phase
Motor Type Brushless DC speed-controlled
Enclosure / Protection Sealed (IP6X), built-in diagnostics
Noise Level Approx. 55 dB under normal conditions

 

Common Questions

Q: What makes “5-55” different from “3-45”?
A: The “5-55” variant is designed to deliver higher head and greater flow under challenging plumbing conditions, while maintaining the smart integrated features of SCALA1.

Q: Can I use this inside the house?
A: Yes — it’s quiet (≈55 dB) and sealed, making it suitable for indoor installations if ventilation and access are acceptable.

Q: What protections are included?
A: Dry-run protection, overload headroom, lock-up protections, plus internal diagnostics via Bluetooth.

Q: How do I configure pressure setpoints?
A: Use the Grundfos GO app via Bluetooth to adjust setpoints, operation modes, and review performance logs.

 

The SCALA1 5-55 combines smart pumping with serious head and flow capability — perfect for demanding residential or light commercial setups.

This item replaces: 97855091

Compare Grundfos SCALA1 Booster Pump Models

Model Voltage Flow Range (GPM) Max Head (m / ft) Type Connectivity Key Use Case
SCALA1 3-45 (99631736) 230 V Up to ≈ 14 GPM ≈ 45 m / 148 ft Self-priming Bluetooth via Grundfos GO app General residential boosting (230 V supply)
SCALA1 3-45 (99631742) 115 V Up to ≈ 14 GPM ≈ 45 m / 148 ft Self-priming Bluetooth via Grundfos GO app Homes with standard 115 V circuits
SCALA1 5-55 (99631739) 230 V Up to ≈ 18 GPM ≈ 55 m / 180 ft High-head, self-priming Bluetooth via Grundfos GO app Multi-story homes / longer pipe runs
SCALA1 5-55 (99631754) 115 V Up to ≈ 18 GPM ≈ 55 m / 180 ft High-head, self-priming Bluetooth via Grundfos GO app High-performance boosting on 115 V supply

 

All SCALA1 boosters share the same smart, compact design — just choose your voltage and performance level for the perfect household pressure solution

Electrical data
Max. P1 1250 W
Rated power - P2 1.09 HP
Main frequency 60 Hz
Rated voltage 1 x 230 V
Rated current 5.25 A
Enclosure class (IEC 34-5) X4D
Insulation class (IEC 85) F
Length of power cable 4.92 ft
Power plug NEMA 6-15 US plug 230V

Technical
Rated flow 21.5 US gpm
Rated head 82.02 ft
Maximum head 180.5 ft
Primary shaft seal BVBP
Approvals CSA,CCSAUS,CSA LLC,PROP65
Approvals for drinking water CSA DW
Curve tolerance ISO9906:2012 3B
Model A
Start pressure 40.61 psi

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


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

View Spec Sheet (PDF)
View Install Manual (PDF)

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