Charles Austen T Series Pond Pumps
A wide continuous-duty range for filters, waterfalls, ponds and hydroponic circulation
T Series is the workhorse water-pump range: twelve current models from 3,600 to 25,000 l/h, with multiple outlet adaptors and maximum heads from 2.2 to 9.5 m. Charles Austen describes the pumps as suitable for submerged or external use.
The synchronous motor includes thermal-overload protection, and the impeller can pass suspended solids up to 6 mm. That makes T Series more tolerant of pond water than a tiny clean-water pump, although the intake still needs protection from leaves and string algae.
Because the family is so broad, the correct T model depends entirely on the operating head. Similar headline flows can have different pressure and power characteristics.
Model Comparison
| Model | Maximum flow | Maximum head | Power |
|---|---|---|---|
| T4000 | 3,600 l/h | 2.2 m | 55 W |
| T5000 | 4,800 l/h | 2.5 m | 67 W |
| T6000 | 6,100 l/h | 2.5 m | 65 W |
| T8000 | 7,800 l/h | 4.0 m | 93 W |
| T9000 | 9,500 l/h | 3.8 m | 105 W |
| T10000 | 10,000 l/h | 4.2 m | 147 W |
| T12000 | 11,300 l/h | 4.5 m | 165 W |
| T15000 | 15,200 l/h | 5.5 m | 215 W |
| T18000 | 17,350 l/h | 6.1 m | 285 W |
| T20000 | 19,100 l/h | 6.3 m | 278 W |
| T23000 | 23,000 l/h | 8.5 m | 520 W |
| T25000 | 25,000 l/h | 9.5 m | 593 W |
Maximum figures compare the models. Real flow falls as lift, pipe friction and connected equipment add resistance.
From garden pond to high-head project
T4000–T6000 serve smaller circulation. T8000–T12000 cover many garden filters and waterfalls. T15000–T20000 step into large pond and elevated-return work; T23000 and T25000 are specialist high-head models.
Notice that T6000 is listed at slightly less power than T5000, and T20000 slightly less than T18000. Use current model data and curves rather than assuming every step is linear.
Solids, adaptors and installation
The stated 6 mm solids capability allows suspended pond waste to pass, but long blanket weed and stones can still block the pump. Use the supplied outlet adaptor that permits the largest practical pipe bore.
External installation needs a flooded inlet. Provide isolation and never allow the pump chamber to run dry.
A family that rewards careful selection
With twelve choices, it is usually possible to avoid gross oversizing. Match the filter flow or feature requirement at total head, then compare wattage among the models that meet it.
Our advice: T Series is versatile, but that is not an excuse to pick by name. We will help plot the operating point if you send the pipework details.
Related Pump and Installation Categories
Charles Austen pump families · Pond filter pumps · Fountain pumps · Pond pipework
Frequently Asked Questions
Can T Series pass solids?
Charles Austen states suspended-solids handling up to 6 mm.
Can it be used externally?
Yes, with the correct flooded external arrangement.
Which T pump has the most head?
T25000, at a published maximum head of 9.5 m.
Why does T6000 use less power than T5000?
Published model data can reflect different motor and hydraulic designs; compare the current curve and wattage.
Can T Series run a biological filter?
Yes, when the selected model delivers the filter’s required flow continuously.
Does it have thermal protection?
Yes. Charles Austen lists thermal-overload protection.
Can it pump blanket weed?
No pump should be expected to pass long fibrous weed reliably; clear and screen it.
Which connections are supplied?
The range includes multiple outlet adaptors, varying by model; use the largest suitable size.
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.
