Boyu · Water / return pump
FP Series Submersible Pump
- Flow
- 300–1,350 L/h
- Power
- 5–19 W
Adding gentle, spread-out circulation to a medium tank or powering a simple internal filter.
4 models
UNS · Water / return pump
UNS Sigma Water Pump
Small submersible DC pumps with an adjustable flow dial. They are the return pumps UNS pairs with its all-in-one tanks, and they also work as a general-purpose pump in a sump or DIY build.
Updated
299–1,499 L/h5–20 W4 models
Will it suit my tank?
litres
Best for
Powering the rear chamber of an all-in-one tank, or a small custom filter or sump.
Worth knowing
Pick the size to match your tank's chamber; the listed flow drops quickly as head height goes up.
What stands out
- Four sizes from about 300 L/h to 1,500 L/h
- Flow is adjustable on the pump
- Low-voltage DC (5 V on the Sigma 5, 12 V on the others)
- IPX8 fully submersible
Models and specs
| Model | Flow | Max head | Power | Dimensions (L × W × H) | Voltage | Outlet size |
|---|---|---|---|---|---|---|
| Sigma 5UNSSG05 | 299 L/h | 0.8 m | 5 W | 5 × 5 × 4.7 cm | DC 5 V | 3/8 in, 1/2 in |
| Sigma 10UNSSG10 | 600 L/h | 1.1 m | 10 W | 4.5 × 6.7 × 7.3 cm | DC 12 V | 3/8 in, 1/2 in |
| Sigma 15UNSSG15 | 900 L/h | 1.6 m | 15 W | 5.1 × 7.5 × 9.5 cm | DC 12 V | 1/2 in |
| Sigma 20UNSSG20 | 1,499 L/h | 2.5 m | 20 W | 6.2 × 10 × 10.5 cm | DC 12 V | 1/2 in, 5/8 in |
- Brand
- UNS
- Rating
- IPX8 submersible
- Control
- Adjustable flow
Figures from Glass Aqua's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
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Boyu · Water / return pump
PGB Series Submersible Pump
- Flow
- 740–1,565 L/h
- Power
- 12.5–28 W
Undergravel plates, sump returns or DIY top filters that need decent head in a narrow space.
3 models
Boyu · Water / return pump
SP-100 / SP-101 Series Powerhead
- Flow
- 300–1,850 L/h
- Power
- 4.5–35 W
Anyone needing a cheap general-purpose pump for circulation, a DIY filter or a small sump return.
9 models
Boyu · Water / return pump
SP-1000 Series Submersible Pump
- Flow
- 300–1,400 L/h
- Power
- 8–34 W
Small sump returns, DIY filters and general water moving jobs around the fish room.
5 models
Frequently asked questions
Quick answers about the UNS Sigma Water Pump, drawn from its specs.
Who is the UNS Sigma Water Pump best for?
Powering the rear chamber of an all-in-one tank, or a small custom filter or sump.
Is there anything to watch out for with the UNS Sigma Water Pump?
Pick the size to match your tank's chamber; the listed flow drops quickly as head height goes up.
What are the alternatives to the UNS Sigma Water Pump?
Other pumps worth comparing: Boyu FP Series Submersible Pump, Boyu PGB Series Submersible Pump, Boyu SP-100 / SP-101 Series Powerhead. Add any of them to the compare table to see the specs side by side.
What sizes does the UNS Sigma Water Pump come in?
4 options: Sigma 5, Sigma 10, Sigma 15, Sigma 20.