Description
OASE AquaMax Eco Premium 21000 Pond Pump
The OASE AquaMax Eco Premium 21000 is an energy-efficient pump for pond filtration, waterfalls and streams. It delivers a maximum flow of 21,000 litres per hour, with a maximum head of 6 metres and power consumption of 20–180 watts, depending on its operating setting.
Pump selection: Maximum flow and maximum head are separate limits. The pump does not deliver 21,000 litres per hour at 6 metres. Actual flow depends on the lift, hose diameter, hose length, fittings and resistance through the filtration system.
Choosing a pump for a waterfall or stream?
Use our interactive waterfall pump selection chart to compare AquaMax Eco Premium models by watercourse width and vertical lift.
Key Features
- Efficient motor: Designed for continuous water circulation in pond filtration and watercourse installations.
- Solids handling: Passes debris up to 11 mm to a suitable pond filter.
- Seasonal Flow Control: Automatically adjusts pump output according to water temperature when enabled.
- Environmental Function Control: Built-in protection against dry running and blockages.
- Flexible installation: Suitable for submerged installation or dry installation in accordance with the manual. Dry installation does not mean the pump can run without water.
- Adjustable second inlet: Connect a compatible skimmer or satellite strainer to draw water from another part of the pond. Accessories sold separately.
- Optional electronic control: Compatible with OASE Control equipment and the Eco Control local controller, sold separately.
- Frost protection: Rated frost-proof down to -20°C, subject to the installation and winter-care instructions.
- Made in Germany.
Optional Pump Controls
The pump can operate without an additional controller. For local monitoring and adjustment, the optional OASE Eco Control (47673) provides a separate control panel with a display and buttons.
Phone or tablet control requires a compatible OASE Control system and the appropriate connection accessories, purchased separately. Downloading the app alone does not connect your phone to the pump.
Technical Specifications — 21000 Model
| Product code | 75934 |
|---|---|
| Dimensions (L × W × H) | 340 × 275 × 160 mm |
| Rated voltage | 220–240 V / 50/60 Hz |
| Power consumption | 20–180 W |
| Power cable length | 10 metres |
| Net weight | 6.9 kg |
| Guarantee | 3 years, plus a 2-year extension subject to OASE registration and guarantee terms |
| Maximum flow rate | 21,000 litres per hour / 350 litres per minute |
| Maximum head | 6 metres |
| Pressure-side connection | G 2 |
| Suction-side connection | G 2 |
| Hose connections | 25 / 32 / 38 / 50 mm (1", 1¼", 1½", 2") |
| Filter intake surface | 1,000 cm2 |
| Maximum debris size | 11 mm |
| OASE Control compatible | Yes — additional control equipment required |
| Electronic adjustment | Yes — using compatible optional control equipment |
| Installation | Submerged or dry installed, following the manual |
Flow Performance and Pump Selection
The comparison graph below shows flow against head for the AquaMax Eco Premium range. Use the curve labelled 21000 when selecting this model.
The vertical axis shows head in metres and the horizontal axis shows flow in litres per minute. Flow decreases as the head increases. Hose friction, fittings and filters add resistance, so the height of a waterfall alone does not give the complete operating head.
For guidance based on waterfall width and vertical lift, view our interactive AquaMax Eco Premium waterfall selection chart.
Seasonal Flow Control (SFC)
When enabled, SFC adjusts the pump output according to water temperature. This can reduce electricity consumption during cooler conditions when a lower circulation rate is appropriate.
Use SFC only where the reduced flow still meets the requirements of your pond, fish and filtration equipment. For a waterfall or stream requiring a consistent appearance, switching SFC off avoids temperature-driven changes in output.
Adjustable Second Inlet
The second inlet allows a compatible surface skimmer or satellite strainer to share the pump's suction with the main filter housing. Adjust the inlet regulator to suit the installation, following the positions and instructions in the manual.
The regulator settings do not guarantee a fixed percentage split: actual flow through each inlet depends on the connected hoses and accessories. Keep the unused second inlet capped as instructed in the manual.
Guarantee and Instructions
A standard 3-year guarantee is available, with an additional 2-year extension subject to OASE registration and guarantee terms.
Download the AquaMax Eco Premium 5000–21000 instruction manual (PDF)
