Grundfos SB & SBA
Reliable submersible pressure pumps
Grundfos SB & SBA pumps are submersible pressure pumps for domestic applications such as private wells and rainwater tanks. Robust, noiseless and easy to install, they reliably deliver up to 3m³ flow per hour.
Both pumps are submersible multistage boosters for pumping clean water. The SB operates with an external control unit like Grundfos PM1 or PM2, while the SBA is an all-in-one solution with integrated controller.
Built for reliability
- Noiseless operation: No noise emitted when submerged – a noiseless alternative to dry installed pumps.
- Robust and reliable: Robust design and corrosion-resistant build of composite and stainless steel materials.
- Energy efficient: Meets the Efficiency Index benchmark of MEI ≥0.70 for most efficient water pumps.
- Integrated protection: Automatically stops operating in cases of overheating or dry-running, restarting when safe.
Pump Features
- No clogging: Stainless steel strainers prevent large particles from entering the pump housing.
- Floating inlet strainer: Optional floating suction strainer draws clean, particle-free water from just below the water surface.
- Non-return valve: Supplied with non-return valve to avoid emptying the pipe during pump stop.
SBA: a model of simplicity
Just plug in and start pumping with the SBA, the easy to install, all-in-one pump with integrated control unit.
Ideal for rainwater harvesting
In addition to private wells, SB and SBA pumps are ideally suited for submerging in rainwater tanks, where roof run-off is collected and filtered.
Harvested rainwater is ideal for garden watering, toilet flushing, washing machines and car washing, thus saving drinking water for drinking. It reduces the risk of flooding with less pressure on the sewer at peak loads, and since it is soft water, prolongs the life of appliances.
Built to your needs
Grundfos SB Variants
The SB pump is used with an external control. The SBA automated booster has built-in control. All SB and SBA pumps are available with an integrated suction strainer (1 mm mesh), or with side inlet/flexible suction hose with floating suction strainer (1 mm mesh).
Quick sizing
The table below provides quick sizing information for Grundfos SB and SBA pumps based on maximum head (Hgeo), horizontal length (L), and pipe diameters.
| Pump Model | Max. H [m] (1" pipe) | Max. L [m] (1" pipe) | Total hor. length [m] with 1" + 3/4"/1" + 1/2" pipes |
|---|---|---|---|
| SB(A) 3-45 at 3m³/h, 2.8 bar | 15 | 15 | 20/4 |
| 10 | 10 | 22/5 | |
| 5 | 15 | 33/8 | |
| 5 | 10 | 35/8.5 | |
| SB(A) 3-35 at 3m³/h, 2.4 bar | 15 | 15 | 46/11 |
| 10 | 10 | 48/11.5 | |
| 5 | 15 | 9/2 | |
| 5 | 10 | 16/17 | |
| 10 | 15 | 11/3 | |
| 10 | 10 | 23/5.5 | |
| 5 | 15 | 25/6 | |
| 5 | 10 | 36/8.5 |
Preconditions:
- 3 bar tap pressure is considered; to achieve 4 bar pressure add 2 more floors.
- Flooded Suction: 0.5 l/s per tap average, usage pattern is taken into account.
- The calculation is based on the assumption that inside the home you use ½" for piping or ¼".
- From the cistern to the house and to that point where you change to a smaller diameter use 1".
- There are considered a NRV and gate valve, an extension from small to bigger pipe and a few 90° bends.
Note: All variants are available with or without a float switch. The float switch stops the pump at low water level, ensuring that surface fragments do not enter the strainer.
Suction kit blue
- 1M. D25 THR. 1" GAS BOX (best. no. 98394164)
- 1M. D25 THR. 1" NPT BOX (best. no. 98394165)
- 1M. D25 THR. 1" GAS BULK (best. no. 97709360)
- 1M. D25 THR. 1" NPT BULK (best. no. 97709371)
Hose length: 1000 mm
Ball diameter: 150 mm
Foot valves material: Polypropylene
Connection: 1"
Hose material: PVC
Find out more
For full technical details of all SB/SBA variants, visit the Grundfos Product Centre.
