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Pentair Jung Drenox Stainless Steel Drainage Pumps
The Pentair Jung Drenox range is a compact submersible drainage pump made entirely from AISI 304 stainless steel, for clear and lightly dirty water. Drenox pumps empty cellars, boiler rooms and sumps, lift rainwater from grilles, gullies and drains, and drain tanks, pools and water features. Four sizes, from the 0.2 kW Drenox 80/7 to the 0.8 kW Drenox 350/12, share the same 1¼” outlet and 10 metres of H07RN-F cable.
The pump housing, impeller and motor casing are all stainless steel, so the pump stands up well to life in a damp pit. A double NBR seal with a sand guard V-ring runs in an oil chamber, and a heat exchange chamber cools the motor so it can run for long periods without being fully submerged. Every model is rated IP68 to a depth of 7 metres, for water up to 40°C.
Choosing the right Drenox model
The higher the numbers in the model name, the more water the pump moves and the higher it lifts it. As a guide, the 80/7 suits small sumps and low lifts, the 160/8 is the everyday cellar and light well pump, and the 250/10 and 350/12 handle bigger inflows, longer pipe runs and lifts of several metres. The table gives Jung’s flow at 3 m and 5 m of head, closer to a real installation than a shut-off figure.
The 80/7 has one feature the others lack: once primed, it pumps down to 3 mm of water, against 35 mm for the larger manual models, so it is the one to choose when you want a floor or shallow pit almost dry. Its 3 mm free passage means it is for clearer water; the larger pumps pass grit and particles up to 6 mm.
Manual, automatic, 110v and three-phase versions
Manual pumps run whenever the power is on; automatic (AUT) versions have a float switch that starts and stops the pump with the water level. The 80/7 is also available in 110v for site transformers, and the 350/12 comes as the 350/12 T for 400v three-phase supplies. Single-phase models have thermal protection built into the winding; the three-phase model needs overload protection in its starter or panel.
| Model | Supply | Motor P2 (kW) | Current (A) | Flow at 3 m (l/min) | Flow at 5 m (l/min) | Highest listed head (m) | Free passage (mm) | Pumps down to (mm) |
|---|---|---|---|---|---|---|---|---|
| Drenox 80/7 | 230v or 110v | 0.2 | 1.3 (230v) | 43 | 17 | 6 | 3 | 3 |
| Drenox 160/8 | 230v | 0.4 | 2.4 | 103 | 60 | 7 | 6 | 35 |
| Drenox 250/10 | 230v | 0.55 | 4.5 | 183 | 130 | 9 | 6 | 35 |
| Drenox 350/12 | 230v | 0.8 | 5.1 | 250 | 200 | 10 | 6 | 35 |
| Drenox 350/12 T | 400v three-phase | 0.8 | 2.0 | 250 | 200 | 10 | 6 | 35 |
Flow is converted from Jung Pumpen’s tables for the 230v and 400v pumps; the highest listed head is where Jung’s table ends and flow is very low. Pump-down levels are for manual versions. Click through to any model for full specifications.
Where to Use Drenox Drainage Pumps
A Drenox is for water that is clear or only lightly soiled: groundwater seeping into a cellar, rainwater collecting below a grille or gully, condensate and water softener discharge, or a tank, pool or water feature you need to empty. It is rated for immersion to 7 metres, so it also works at the bottom of a deep chamber. Our guide to what a drainage pump is and where to use one covers the basics.
For a permanent cellar or basement sump, choose an automatic version and size the pit so the pump starts no more than 30 times an hour, the limit in the Drenox instructions. Pick the model on flow at your real lift: a 160/8 moves around 100 l/min at 3 metres, while a 350/12 still gives about 200 l/min at 5 metres. Our basement sump pump guide covers pit sizing, and the guide to pump head and flow rate explains how lift and pipe length cut flow.
Know where the range stops. The 3 mm and 6 mm free passages suit grit and fine particles, not leaves, sludge or sewage. For dirtier water with larger soft solids, step up to the Jung Omnia stainless steel vortex pumps; for toilet waste and foul water, the Jung Nocchi Priox sewage pumps; and for corrosive liquids, the JS Drainer 316 stainless steel range.
Frequently Asked Questions
Which Drenox pump drains a floor or shallow pit almost dry?
The Drenox 80/7. Once primed and running, Jung rates it to pump down to 3 mm of water, so it clears a flooded floor, a shallow pit or the last of a tank. The larger models stop at about 35 mm in their manual versions.
What water can a Drenox drainage pump handle?
Clear water, partly dirty water and non-aggressive liquids up to 40°C. Solids must pass 3 mm on the 80/7 and 6 mm on the larger models, so silt and grit are fine but leaves, rag and sewage are not. Flammable or dangerous liquids are ruled out.
How does the automatic Drenox float switch work?
The AUT versions have a float switch on the pump that starts it as the water rises and stops it as the level falls. Jung gives start and stop levels of about 250 mm and 100 mm for the 80/7 AUT, rising to about 351 mm and 111 mm for the 250/10 and 350/12 AUT, so leave room for the float to move. A manual pump can be automated with a separate float switch; our float switch guide explains the types.
Can a Drenox run when it is not fully submerged?
Yes, for long periods. A heat exchange chamber cools the motor, so it keeps working when the water drops below the motor casing. It must never run completely dry, so on unattended jobs use an automatic version or a float switch.
Do Drenox pumps have thermal overload protection?
The 230v single-phase models have a thermal overload in the motor winding that resets automatically. The three-phase Drenox 350/12 T does not, so wire it through a motor protection circuit breaker or a contactor with a thermal overload relay.
What hose or pipe fits a Drenox?
Every model has a 1¼” outlet and comes with an elbow fitting for 32 mm hose. For a permanent installation in rigid pipe, fit a non-return valve, as the instructions require, so water in the rising main does not drain back into the sump.
For help choosing a Drenox, call the AES Rewinds team on 01252 515169 or email sales@aesrewinds.com. You can also browse all our drainage pumps or sump pumps with a float switch.
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