Product Overview
The Grundfos SCALA1 5-55 model 99631754 is a 115V self-priming booster system for residential and light water-supply applications that require the higher-output SCALA1 5-55 hydraulic range. The integrated unit combines the pump, motor, pressure sensor, controller, and small pressure tank, allowing it to start and stop automatically as water demand changes. Bluetooth communication supports compatible setup, monitoring, and diagnostics through the Grundfos GO app.
The “5-55” name is a model designation, not a 5-to-55 GPM flow range. Confirmed data lists a rated flow of 23.2 GPM, rated head of 82.02 ft, and maximum head of 180.5 ft. These values occur at different points on the performance curve. The correct pump must be selected by comparing the required flow with total dynamic head, including source conditions, elevation, pipe losses, inlet pressure, and desired outlet pressure.
This version operates on 115V single-phase power, draws a confirmed rated current of 11.6A, and uses a Type B NEMA 5-15 plug. Confirm the circuit capacity, water source, system pressure, plumbing arrangement, and installation environment before purchase. Follow the Grundfos specification sheet and installation manual for priming, setup, and commissioning.
Key Features:
- Higher-output SCALA1 self-priming booster system
- 115V single-phase operation
- Integrated pump, motor, sensor, controller, and tank
- Bluetooth support through the Grundfos GO app
- Automatic response to water demand
- Built-in operating protections
- 1 in. NPT male inlet and outlet
Common Uses:
- Residential pressure boosting with higher demand
- Multi-story or longer-pipe-run systems when properly sized
- Storage-tank and rainwater supply
- Compatible garden and irrigation applications
Technical Specifications:
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Model: SCALA1 5-55
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Product Number: 99631754
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Voltage: 115V single phase
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Maximum Input Power: 1250W
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Rated Motor Output: 1.15 HP
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Rated Current: 11.6A
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Rated Flow: 23.2 GPM
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Rated Head: 82.02 ft
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Maximum Head: 180.5 ft
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Start Pressure: 40.61 PSI
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Maximum Operating Pressure: 116.03 PSI
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Maximum Inlet Pressure: 29.01 PSI
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Connections: 1 in. NPT male inlet and outlet
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Liquid Temperature Range: 32-113°F
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Power Cord: 4.92 ft with NEMA 5-15 plug
Dimensions and Weight:
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Net Weight: 30.9 lb
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Gross Weight: 35.3 lb
Installation and Sizing Notes:
Use the manufacturer pump curve to confirm the required duty point. Verify circuit capacity, suction conditions, available inlet pressure, pipe size, system losses, water temperature, drainage, ventilation, service clearance, and freeze protection.
FAQ:
Does “5-55” mean 5 to 55 GPM?
No. It is the model designation; the confirmed rated flow is 23.2 GPM.
What is the maximum head?
The confirmed maximum head is 180.5 ft at a different point from rated flow.
What electrical supply is required?
This version is rated for 115V single-phase power and uses a NEMA 5-15 plug.
Can settings be accessed through an app?
Supported setup and monitoring are available through Bluetooth and the Grundfos GO app.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear technical information, helpful support, and convenient online ordering for residential water-pressure systems.
