Product Overview
The Grundfos SCALA1 5-55 model 99631739 is a 230V self-priming booster system for applications that require a higher flow class and greater maximum head than the SCALA1 3-45 models. The integrated enclosure combines the pump, motor, sensor, controller, and small pressure tank, allowing the unit to start and stop automatically with water demand. Bluetooth communication supports compatible monitoring and configuration through the Grundfos GO app.
The “5-55” model designation is not a 5-to-55 GPM flow range. The confirmed specifications list a rated flow of 21.5 GPM, rated head of 82.02 ft, and maximum head of 180.5 ft. These values occur at different points on the pump curve. Selection should be based on the flow needed at the calculated total dynamic head, including inlet pressure, suction conditions, elevation, pipe losses, and the required outlet pressure.
This version uses 230V single-phase power and a NEMA 6-15 plug. Confirm the available circuit, water source, system pressure, plumbing arrangement, and installation environment before ordering. This product is identified as a replacement reference for Grundfos 97855091; verify the complete operating point and connection requirements before substitution.
Key Features:
- Higher-output SCALA1 self-priming booster system
- 230V single-phase operation
- Integrated pump, motor, sensor, controller, and tank
- Bluetooth support through the Grundfos GO app
- Automatic operation based on 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 water systems when properly sized
- Storage-tank and rainwater supply systems
- Compatible garden and irrigation applications
Technical Specifications:
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Model: SCALA1 5-55
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Product Number: 99631739
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Voltage: 230V single phase
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Maximum Input Power: 1250W
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Rated Motor Output: 1.09 HP
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Rated Current: 5.25A
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Rated Flow: 21.5 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 6-15 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:
Compare the required duty point with the manufacturer pump curve. Confirm electrical service, suction lift, available inlet pressure, pipe size, system losses, water temperature, ventilation, drainage, service clearance, and freeze protection. Follow the linked Grundfos specification sheet and installation manual.
FAQ:
Does “5-55” mean the pump delivers 5 to 55 GPM?
No. It is the model designation; the confirmed rated flow is 21.5 GPM.
What is the maximum head?
The confirmed maximum head is 180.5 ft, at a different operating point from rated flow.
What power supply is required?
This product number requires 230V single-phase power and uses a NEMA 6-15 plug.
What older product number is referenced?
This listing identifies 97855091 as a replacement reference; verify system compatibility before substitution.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear technical information, helpful support, and convenient online ordering for residential water-pressure systems.
