The Grundfos SCALA1 5-55 (product number 99631739) is a compact, self-priming home water booster that raises pressure from a tank, cistern or weak mains supply, delivering up to 180.5 ft of head and 22 US gpm. Pump, motor, controller and check valve are built into one enclosure, so it installs as a single unit with no separate control box to wire. It ships with a fitted NEMA 6-15 plug on a 4.92 ft cable — plug in, prime, and it runs.
Performance & Hydraulic Data
| Maximum head | 180.5 ft |
| Nominal flow | 22 US gpm |
| Nominal head | 90.56 ft |
| Maximum operating pressure | 116.03 psi |
| Maximum inlet pressure | 29.01 psi |
| Start pressure | 40.61 psi |
| Speed | 3450 rpm |
| Curve tolerance | ISO9906:2012 3B |
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F.
Motor & Electrical Data
| Rated voltage | 230 V |
| Phase | 1 |
| Frequency | 60 Hz |
| Rated current | 5.25 A |
| Maximum power input (P1) | 1250 W |
| Rated output (P2) | 1.09 kW |
| Power plug | NEMA 6-15 |
| Power cable length | 4.92 ft |
| Insulation class | F |
| Enclosure class | IPX4D |
Materials of Construction
| Pump housing | Composite |
| Impeller | Composite |
| Shaft seal | BVBP |
Connections & Operating Limits
| Inlet connection | 1" NPT(M) |
| Outlet connection | 1" NPT(M) |
| Connection pressure rating | PN 8 |
| Liquid temperature range | 32 to 113 °F |
| Ambient temperature range | 32 to 131 °F |
Dimensional Drawing
Approvals, Weights & Identification
| Grundfos product number | 99631739 |
| EAN | 5713832222018 |
| Approvals | CSA,cULus,CCSAUS,CSA LLC,PROP6 |
| Drinking water approval | CULUS DW |
| Net weight | 30.9 lb |
| Gross (shipping) weight | 35.3 lb |
| Country of origin | Hungary |
| HS / customs tariff code | 8413.70.2040 |
Typical Applications
Domestic pressure boosting on weak mains • tank and cistern boosting • rainwater harvesting • shallow wells within suction range • multi-storey homes • small commercial premises and irrigation.
Need help? Contact ForeverPure Place
for pricing, lead time, or help choosing between SCALA1 and SCALA2.
