Grundfos SCALA1 3-45 (99631742) — 115V Self-Priming All-in-One Booster Pump
The Grundfos SCALA1 3-45 (115V) integrates pump, sensor, motor, controller, and tank in a single compact unit. Designed for residential pressure boosting, shallow well supply, or tank-fed systems, it delivers around 14.9 GPM at a maximum head of ~150.9 ft. With built-in Bluetooth connectivity, diagnostics, and protection features, it’s a smart, streamlined solution.
Key Features & Benefits
- Compact, integrated design — pump, motor, electronics & tank combined
- Self-priming capability (pumps from depths up to ~26 ft)
- Bluetooth enabled — configure and monitor via Grundfos GO app
- Twin mode support (duty/standby) with optional kit
- Selectable suction modes: tank lift, positive pressure (city supply), and air purge mode
- Built-in check valves to prevent backflow
- Over-pressure and dry-run protection, anti-cycling feature
- Quiet, water-cooled motor design, enclosed composite housing
Applications
- Residential pressure boost where city pressure is weak
- Tank to house water supply
- Shallow well water systems
- Rainwater harvesting / cistern boosting
Specifications
| Model / Variant |
SCALA1 3-45 (99631742) |
| Rated Flow |
14.9 GPM |
| Max Head |
150.9 ft (46 m) |
| Voltage / Phase |
115 V, Single-phase |
| Power / Current |
950 W / 8.62 A |
| Max System Pressure |
116 psi (8 bar) |
| Max Inlet Pressure |
43.5 psi (3 bar) |
| Suction Lift |
~26 ft (8 m) |
| Inlet / Outlet Ports |
1″ NPT / 1″ NPT |
Common Questions
Q: What is the maximum suction lift?
A: About 26 ft (8 m), assuming proper priming and airtight suction plumbing.
Q: Will the pump shut off if it runs dry?
A: Yes — the built-in dry-run protection stops operation to prevent damage.
Q: Does it have multiple suction modes?
A: Yes — manual switching between tank lift (low suction), positive inlet pressure, and air-purge mode.
Q: How is Bluetooth used?
A: Connect via the Grundfos GO app to configure settings, review diagnostics, and monitor performance.
A sleek, powerful 115V booster pump for homes needing compact, smart pressure control with no extra hardware.
This item replaces: 96860172
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 950 W
Rated power - P2 0.791 HP
Main frequency 60 Hz
Rated voltage 1 x 115 V
Rated current 8.62 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
Technical
Rated flow 14.9 US gpm
Rated head 82.02 ft
Maximum head 150.9 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 31.91 psi
Installation
Range of ambient temperature 32 .. 131 °F
Maximum operating pressure 116.03 psi
Maximum permissible inlet pressure 43.51 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
