How deep can a self-priming pump draw from?

A self-priming surface pump operates reliably up to a physical suction limit of about 9 meters, and the deeper it draws from, the less usable head remains. For a working water level deeper than 8 meters, a borehole pump is the right choice.

How do I convert bar to meters when sizing a pump?

1 bar corresponds to approximately 10.2 meters of water column. Enter the desired outlet pressure in bar and multiply by 10.2 to get the head requirement in meters.

What does the letter m mean in borehole pump model names?

In the borehole pump model designation, m (e.g. 4RSm) indicates the 1×230 V single-phase version; without m, the model is 3×400 V three-phase.

Which NERO pump should I choose if several are suitable?

If several models meet the duty point, the one with the smaller motor is the more economical choice, since it delivers the same flow rate and pressure with less energy. The NERO pump selector automatically ranks this first.

Pump Selector

Specific model recommendation based on the performance curve

Enter the water source and parameters – the engine interpolates on the catalog performance curve to recommend 1–2 specific NERO Pumps models for the given duty point.

How does it work?

Select the water source type.
Borehole / dug / solar: desired wellhead pressure + working water level depth – the engine adds the two together.
Self-priming: desired pressure + suction lift.
The engine interpolates on the catalog performance curve and ranks models by the H delivered at the duty point (Q).

The recommendation is for guidance only – contact our experts for a precise system design (pipe losses, cycling, pressure tank).