25mm QW Submersible Sewage Pump 8m³/h 22m 1.1kW Mobile Pump

Flow and head don’t scale together, and this model is a good example of that. The QW-25-8-22-1.1 only moves 8 m³/h — modest — but it’s rated for 22 m of head, which is enough to push wastewater up three or four floors of a building, or out of a deep excavation pit on a construction site. If your job is “get this water up and over,” not “move a lot of it,” this is the profile you want rather than a high-flow low-head pump.

Because it’s a mobile QW unit with no coupling base, setup is direct: lower it on its chain, connect the discharge hose, and go. That also means every meter of hose you add works against your effective head, so don’t assume the 22 m rating is available on top of a long horizontal run — friction loss eats into it.

The motor needs to stay mostly submerged during operation; running it half-exposed for extended periods is the most common reason these units overheat on job sites.

FAQ

Q: If I add 15 meters of hose, will I lose flow?

A: Yes — hose length and elbows both add resistance that reduces effective head, so the real-world flow at the far end will be lower than the rated 8 m³/h figure. Plan for some margin.

Q: Can I run this on a generator instead of grid power?

A: Yes, as long as the generator’s stable output covers the 1.1 kW startup and running load with margin; undersized generators are a common cause of motor trip-outs on temporary sites.