Description
The Grundfos 99631739 (SCALA1 5-55) is a Booster set 1.09HP 230V 1-Phase — SCALA1 is a fully integrated, compact self-priming, pressure booster for domestic use. It can communicate with Grundfos GO Remote app via built-in Bluetooth technology enabling high customization options.. Nominal performance: 22US gpm at 90.56ft. Designed for Residential groundwater intake, Residential rainwater harvesting, Residential water pressure boosting.
Why This Product
Genuine Grundfos Parts and Accessories
Genuine Grundfos replacement parts and accessories are manufactured to the same specifications as the original components — ensuring correct fit, correct function, and maintenance of original pump performance.
OEM Quality — Maintains Warranty Coverage
Using genuine Grundfos replacement parts maintains pump warranty coverage where applicable. Third-party parts may void warranty coverage and can cause performance changes and premature failure.
Compatibility Confirmed
Grundfos accessories and replacement parts are tested for compatibility with specific Grundfos pump models. Part numbers are model-specific — always verify using your pump's model number and serial number.
PumpStop Expert Support
Not sure if this is the right part for your pump? Contact PumpStop with your pump model number and serial number — our team will confirm compatibility before you order.
| Nominal Flow | 22US gpm |
| Nominal Head | 90.56ft |
| Max Operating Pressure | 116.03psi |
| Max Fluid Temperature | 113°F |
| Max Ambient Temperature | 131°F |
| Power | 1.09HP |
| Voltage | 230V |
| Phase | 1-Phase |
| Frequency | 60 Hz |
| Full Load Current | 5.25A |
| Insulation Class | F |
| Protection Class (IP) | IPX4D |
| Cable / Plug Type | US plug 230V |
| Inlet Connection | 1inch |
| Outlet Connection | 1inch |
| Pipe Pressure Rating | PN 8 |
| Impeller Material | Composite |
| Housing Material | Composite |
| Model Number | 99631739 |
| Product Series | SCALA1 5-55 |
| Model Code | SCALA1 5-55 |
| Approvals / Certifications | CSA, cULus, CCSAUS, CSA LLC, PROP6 |
| Electrical | Requires correctly rated supply — 230V, 1-Phase, 60 Hz. Install with correctly rated circuit protection and motor starter. |
| Temperature limits | Do not exceed max fluid temperature 113°F or max ambient temperature 131°F. Operating outside these limits will damage seals and motor insulation. |
| Dry running | Do not run dry. SCALA1 5-55 pumps use the pumped fluid to lubricate the shaft seal — dry running destroys the seal within seconds. Install dry-run protection on all automatic installations. |
| Maintenance | Refer to the Grundfos Installation and Operating Manual (IOM) for correct installation, commissioning, and maintenance intervals. Contact PumpStop for documentation. |
Motor Curves
Dimensional Drawing
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