JS JST & JST H - Heavy Duty Submersible Pumps
The JS JST and JST-H heavy duty submersible pump range is the three-phase, 400v drainage pump for sites, plant rooms and industrial premises where a single-phase pump runs out of power. Thirteen models run from the compact 0.4 kW JST-4, at 240 litres per minute, to the 7.5 kW JST-75, which moves up to 2,000 litres per minute through a 6-inch outlet.
Every JST pump has a stainless steel shaft and motor case, with a cast iron motor top cover, lower motor and seal housing, pump case, impeller and volute. Twin mechanical seals (carbon ceramic and silicon carbide) run in a lubricated chamber, and each pump comes with 10 metres of power cable. They are built for drainage and dewatering of clean and dirty water.
Choosing between JST and JST-H models
The number in the model name is the motor size: a JST-4 has a 0.4 kW motor, a JST-22 a 2.2 kW motor and a JST-75 a 7.5 kW motor. The JST-8 comes with a 2-inch or a 3-inch outlet; performance is the same, so match it to your hose.
H means high head. The JST-15H, 22H, 37H, 55H and 75H use the same motors as their standard twins, on a smaller outlet, to lift water higher at a lower flow. The JST-22H, for example, reaches 30 metres against 20 metres for the JST-22, but moves 650 litres per minute instead of 850. Choose a standard JST when volume is the priority, and an H model when the discharge point is well above the water or the hose run is long.
Supply and connections. All JST pumps need a 400v three-phase supply and are manual, but JS states every model can be automated with a control panel and floats. Hose tails come with every model except the JST-37, JST-55 and JST-75. On 110v or 230v, the JS Heavy Duty Contractor range is the single-phase equivalent.
| Model | Type | Outlet | Max Flow (l/min) | Max Head (m) | Motor (kW) |
|---|---|---|---|---|---|
| JST-4 | Standard | 2″ | 240 | 12 | 0.4 |
| JST-8 2″ | Standard | 2″ | 380 | 15 | 0.75 |
| JST-8 3″ | Standard | 3″ | 380 | 15 | 0.75 |
| JST-15 | Standard | 3″ | 500 | 18 | 1.5 |
| JST-22 | Standard | 3″ | 850 | 20 | 2.2 |
| JST-37 | Standard | 4″ | 1,300 | 24 | 3.7 |
| JST-55 | Standard | 4″ | 1,800 | 22 | 5.5 |
| JST-75 | Standard | 6″ | 2,000 | 31 | 7.5 |
| JST-15H | High head | 2″ | 450 | 23 | 1.5 |
| JST-22H | High head | 2″ | 650 | 30 | 2.2 |
| JST-37H | High head | 2″ | 850 | 35 | 3.7 |
| JST-55H | High head | 3″ | 1,050 | 32 | 5.5 |
| JST-75H | High head | 4″ | 1,600 | 40 | 7.5 |
Flow and head are JS Pumps’ published maximums. Click through to any model for its full specifications, weight and dimensions.
Showing all 13 results
240 l/min · 12 m · 400v
JS JST-4 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 240 l/min and ...Read More£236.80 +VAT
380 l/min · 15 m · 400v
JS JST-8 2" 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 380 l/min ...Read More£347.20 +VAT
380 l/min · 15 m · 400v
JS JST-8 3" 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 380 l/min ...Read More£347.20 +VAT
500 l/min · 18 m · 400v
JS JST-15 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 500 l/min and ...Read More£574.21 +VAT
850 l/min · 20 m · 400v
JS JST-22 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 850 l/min and ...Read More£933.70 +VAT
1,300 l/min · 24 m · 400v
JS JST-37 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 1,300 l/min and ...Read More£1,089.64 +VAT
1,800 l/min · 22 m · 400v
JS JST-55 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 1,800 l/min and ...Read More£1,692.70 +VAT
2,000 l/min · 31 m · 400v
JS JST-75 400v three-phase heavy duty submersible drainage pump for clean and dirty water. Up to 2,000 l/min and ...Read More£1,918.33 +VAT
450 l/min · 23 m · 400v
JS JST-15H 400v three-phase high head heavy duty submersible drainage pump for clean and dirty water. Up to 450 ...Read More£648.04 +VAT
650 l/min · 30 m · 400v
JS JST-22H 400v three-phase high head heavy duty submersible drainage pump for clean and dirty water. Up to 650 ...Read More£1,007.53 +VAT
850 l/min · 35 m · 400v
JS JST-37H 400v three-phase high head heavy duty submersible drainage pump for clean and dirty water. Up to 850 ...Read More£1,163.47 +VAT
1,050 l/min · 32 m · 400v
JS JST-55H 400v three-phase high head heavy duty submersible drainage pump for clean and dirty water. Up to 1,050 ...Read More£1,766.53 +VAT
1,600 l/min · 40 m · 400v
JS JST-75H 400v three-phase high head heavy duty submersible drainage pump for clean and dirty water. Up to 1,600 ...Read More£1,992.16 +VAT
Where to Use JST Heavy Duty Pumps
JST pumps are the three-phase workhorses of site drainage. Contractors use them to dewater foundations, trenches, shafts and basement excavations, facilities teams use them to empty plant room, lift pit and car park sumps, and they are a common choice for flood clearance on commercial and industrial sites with a 400v supply. The cast iron pump end and stainless steel motor case are made for the knocks of site work.
Size the pump on the duty point, not the headline flow. Lift height and hose length both reduce the flow you get at the discharge end, so a pump that looks generous on paper can fall short on a deep excavation. Our guide to pump head and flow rate explains total head, and our guide to reading a pump curve shows how to find where a pump will actually run. If a standard JST runs out of lift before your duty point, move to its H version.
Know where the range stops. JST pumps handle clean and dirty water with small solids, not sewage or heavy slurry. For foul water on a 400v supply, see the JST SV sewage vortex pumps; for sand, silt and slurry, the JST KB and JST KZN ranges have agitators built for it. If you prefer a top outlet design, the JS RST 400v range covers similar sizes.
Frequently Asked Questions
What does the H mean in JST-22H or JST-75H?
H stands for high head. Each H model uses the same motor as the standard pump of the same number but is built to lift higher at a lower maximum flow. The JST-75H, for example, reaches 40 metres and 1,600 l/min, against 31 metres and 2,000 l/min for the JST-75.
Why does the JST-55 have less head than the JST-37?
JS publishes 22 metres for the JST-55 and 24 metres for the JST-37, because the JST-55 is set up to move volume: up to 1,800 l/min against 1,300 l/min. If your job needs both a 5.5 kW pump and more lift, the JST-55H reaches 32 metres, and the JST-75H 40 metres.
Should I choose the 2-inch or 3-inch JST-8?
JS publishes the same 380 l/min and 15 metres for both, so choose the outlet that matches your hose and couplings. The 3-inch version helps on longer runs, where the larger hose loses less flow to friction; our guide to discharge pipe sizing explains why.
Which JST pumps come with a hose tail?
According to JS, hose tails are supplied with the JST-4, JST-8, JST-15 and JST-22 and with all five high head models. The JST-37, JST-55 and JST-75 are supplied without one, so check how you will connect your hose or pipework before ordering.
Is there a single-phase version of the JST?
Not in this range: every JST motor is 400v three-phase. For 110v site transformers or 230v mains, the JS Heavy Duty Contractor pumps use a similar cast iron and stainless steel build from 0.25 kW to 1.5 kW, including the high head JS-1500H.
Can a JST pump clear water down to the floor?
No. Like any standard submersible, it stops drawing once the water level falls below the intake. To clear the last few millimetres from a slab or floor, follow on with a residue pump such as the JS RSD 150 Puddle Buddy.
If you would like help choosing a JST pump for a site, sump or hire fleet, call the AES Rewinds team on 01252 515169 or email sales@aesrewinds.com. You can also browse the full JS Pumps range or all dewatering pumps.
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