JS RS/T AL High Flow Propeller Pumps
JS RS/T AL high flow propeller pumps are submersible pumps built to move a large volume of water a short height. Where a conventional drainage pump trades volume for lift, the AL series uses a propeller instead of an impeller, so a 0.75 kW model delivers up to 1,055 litres per minute through a 4″ top outlet. That suits water features, weirs and cascades, display basins, river and stream feeding, and emergency pumping where the water only has to clear a low bank or wall.
The four models share one construction: a stainless steel outer case, shaft, motor case, lower motor seal and bearing housing and motor top cover, with twin mechanical seals (carbon ceramic and silicon carbide) in a lubricated chamber. They handle clean and dirty water with solids up to 5 mm and come with 10 metres of power cable. No hose tail is supplied, so plan a 4″ hose or pipe connection.
Choosing a high flow propeller pump
The range comes in two sizes. The RS-400 AL and RST-4 AL have 0.4 kW motors and give up to 620 l/min, with flow falling to nothing at 3 metres of head. The RS-750 AL and RST-8 AL have 0.75 kW motors and give up to 1,055 l/min, falling to nothing at 5 metres. Both sizes give their best flow with as little lift as possible, so measure the height from the water surface to the discharge point before you choose.
Single-phase or three-phase. The RS models run on a 230v single-phase supply and the RST models on 400v three-phase. Each pair shares the same performance curve, so choose on the supply you have at the feature or site.
Need more lift? If the water has to go higher than about 3 metres, a propeller pump is the wrong tool. The JS RS top outlet pumps (single-phase) and JS RST top outlet pumps (three-phase) lift far higher at lower flow.
| Model | Supply | Motor (kW) | Outlet | Max Flow (l/min) | Max Head (m) |
|---|---|---|---|---|---|
| RS-400 AL | 230v single-phase | 0.4 | 4″ | 620 | 3 |
| RS-750 AL | 230v single-phase | 0.75 | 4″ | 1,055 | 5 |
| RST-4 AL | 400v three-phase | 0.4 | 4″ | 620 | 3 |
| RST-8 AL | 400v three-phase | 0.75 | 4″ | 1,055 | 5 |
Flow and head are the maximums from the JS performance curves. Click through to any model for its full details and performance curve.
Showing all 4 results
620 l/min · 3 m · 230v
JS RS-400 AL 230v high flow propeller pump for water features, low lift transfer and drainage. Up to 620 ...Read More£979.93 +VAT
1,055 l/min · 5 m · 230v
JS RS-750 AL 230v high flow propeller pump for water features, low lift transfer and drainage. Up to 1,055 ...Read More£1,133.11 +VAT
620 l/min · 3 m · 400v
JS RST-4 AL 400v high flow propeller pump for water features, low lift transfer and drainage. Up to 620 ...Read More£979.93 +VAT
1,055 l/min · 5 m · 400v
JS RST-8 AL 400v high flow propeller pump for water features, low lift transfer and drainage. Up to 1,055 ...Read More£1,133.11 +VAT
Where to Use High Flow Propeller Pumps
A propeller pump is at its best when the job is about volume rather than height. In a water feature, that means feeding a weir, a cascade or a display basin where the outlet sits a metre or two above the pond surface and you want a thick, even sheet of water. On estates, parks and commercial grounds, the same pumps circulate ponds and lakes and feed rivers and streams, again at low lift.
The AL series also earns its keep in emergency pumping, such as moving flood water out of a flooded area and over a low wall, bank or bund. Here the large 4″ outlet and high flow clear standing water quickly, as long as the discharge point stays low. Our guide to flood pumps covers the wider choice of pumps for flooding, including when a higher head pump is the better option.
Before you buy, work out the total head: the vertical lift from the water surface to the discharge point, plus the friction losses in the hose or pipe. Our guide to pump head and flow rate explains how the two trade off, and our guide to reading a pump curve shows how to find the flow you will actually get. On these pumps every half metre counts, because the curves fall to zero flow at 3 metres and 5 metres.
Frequently Asked Questions
What is a propeller pump?
A propeller pump moves water along the axis of the shaft with a propeller, much like a boat’s propeller, rather than flinging it outwards with a centrifugal impeller. The result is a very high flow at low head. For comparison, the RS-750 AL and the conventional RS-750 drainage pump both have 0.75 kW motors, but the AL moves up to 1,055 l/min to a maximum of 5 metres, while the RS-750 moves up to 345 l/min but reaches 15 metres.
How much water will an AL pump move at my lift?
Less than the maximum flow, and the gap grows quickly with height. Reading the JS curves, the RS-750 AL and RST-8 AL give roughly 700 l/min at 2 metres of head, and the RS-400 AL and RST-4 AL roughly 500 l/min at 1 metre. If your total head is close to 3 or 5 metres, step up a size or choose a higher head pump.
What is the difference between RS AL and RST AL models?
Only the motor supply. The RS-400 AL and RS-750 AL run on 230v single-phase, and the RST-4 AL and RST-8 AL on 400v three-phase. Each pair has the same flow, head and 4″ outlet, so pick the one that matches the supply at your pump position.
Can an AL pump run automatically?
Yes. The pumps are supplied without a float switch, and JS states every model can be made to work automatically with a control panel and float switches. Our float switch guide explains the options, and our pump controls section lists the panels and floats we supply.
Do AL pumps come with a hose tail?
No. JS supplies the AL series without a hose tail, so you will need a 4″ connection to suit your hose or pipework. Our hose and accessories range is a good place to start, or ask us to put a complete kit together.
For help choosing a high flow propeller pump for a water feature, lake or emergency transfer job, call the AES Rewinds team on 01252 515169 or email sales@aesrewinds.com. You can also browse all pond pumps or the full JS Pumps range.
Free, independent advice
Need help choosing? Ask our team
Not sure it is the right pump or motor for the job? Send us a question and our team will reply, or call us now. We have been supplying, repairing and rewinding pumps since 1948.
Monday to Friday, 8.30am to 5.30pm
Send us a question
We reply within one working day.