Charles Austen HX Compact Water Pumps
Small submersible pumps for aquariums, nutrient reservoirs and local water movement
The HX family covers the genuinely compact end of water movement. The HX800 is a 3 W, 285 l/h pump for desktop features and small tanks; HX2000 and HX2500 provide 650 l/h at different head figures; HX4500 reaches 2,000 l/h and 2.4 m.
Charles Austen recommends HX pumps for creating circulation in specific areas, improving movement where oxygen is poor or debris tends to settle. In aquariums, more than one small pump can create a broader current without one harsh central jet.
These pumps are for clean water. Protect the intake from gravel, roots and string algae, and do not mistake the model number for the litres-per-hour figure.
Model Comparison
| Model | Maximum flow | Maximum head | Power |
|---|---|---|---|
| HX800 | 285 l/h | 0.5 m | 3 W |
| HX2000 | 650 l/h | 1.0 m | 10 W |
| HX2500 | 650 l/h | 1.3 m | 12 W |
| HX4500 | 2,000 l/h | 2.4 m | 35 W |
Maximum figures compare the models. Real flow falls as lift, pipe friction and connected equipment add resistance.
Use HX for targeted circulation
A small pump can remove a dead corner behind aquarium decoration, circulate a hydroponic reservoir or feed a compact tabletop feature. It is often better to direct moderate flow across the area than simply increase total turnover elsewhere.
HX2000 and HX2500 share the same published maximum flow; HX2500 offers the stronger head where the outlet must rise.
Choose the current as well as the turnover
Fish, shrimp and plants differ in their tolerance of flow. Aim the outlet along glass or across the surface to spread the jet. Secure the pump so vibration is not transferred to the tank.
For a water feature, check lift carefully: the HX800 maximum head is only 0.5 m and usable flow will be small before that point.
Keep compact pumps accessible
Small impellers and intakes show fouling quickly. Keep the unit where the cover can be opened without dismantling the whole display.
Our advice: HX is a circulation tool, not a pond filter pump. Choose it when the water is clean and the job is local.
Related Pump and Installation Categories
Charles Austen pump families · All pond pumps · Aquarium accessories · Fountain pumps
Frequently Asked Questions
Which is the smallest HX pump?
HX800, at 285 l/h, 0.5 m maximum head and 3 W.
Why do HX2000 and HX2500 have the same flow?
Both are listed at 650 l/h, but HX2500 has the higher head and power.
Can HX4500 run a small feature?
Yes, if its 2,000 l/h and 2.4 m maximum-head curve suits the installed lift.
Can HX pumps move pond debris?
They are compact clean-water pumps, not large-cage solids-handling filter pumps.
Can I mount one in an aquarium?
Yes, with safe positioning and a current appropriate to the livestock.
Can two pumps be used together?
Yes. Two smaller directed flows can improve circulation in an awkward tank.
Can HX800 lift water half a metre?
Half a metre is its maximum head, where flow approaches zero; choose more head for useful flow at that height.
Does the model number equal flow?
No. Use the published specification table, not the digits in the name.
Does maximum flow tell me what reaches the outlet?
No. Maximum flow is measured at little or no head. Lift, pipe length, fittings and connected equipment reduce delivered flow.
Is maximum head the height for full flow?
No. It is the shut-off end of the curve, where useful flow approaches zero.
Should I use the largest practical pipe bore?
Yes. Generous, smooth pipework usually improves real flow and efficiency.
Can I throttle the pump with a valve?
Where permitted, a valve can trim flow, but heavy throttling wastes performance. Correct sizing or approved electronic control is preferable.
How often should the pump be cleaned?
Inspect and clean the intake and impeller whenever output falls and during routine pond maintenance.
Can you help me choose the model?
Yes. Send us the desired flow, vertical lift, pipe bore and length, fittings and connected filter or feature.
Why is my flow lower than the model name?
The model figure is a maximum comparison point, not the delivered flow through a real installation.
