Before choosing an Aquarius submersible electric pump, you need to know the characteristics of the water source (well, well, etc.), because for reliable and durable operation of the pump the following conditions are necessary:

the flow rate of the water source must be greater than the capacity of the selected pump;
the electrical network must provide normal voltage at the pump plug; it is advisable to immediately lay a power cable (extension cord) with a cross-section of 2.5 mm2;
the casing pipe (if it is a well) must have an internal diameter of 120 mm or more for BTsPE series pumps and at least 100 mm for BTsPEU series pumps, in addition, the casing pipe must not have bends or internal seams that would prevent the pump from passing through it.
The Aquarius electric pump must be completely immersed in water in accordance with the attached instructions before switching on and during further operation.
In other words, for uninterrupted water supply, there must be enough water in the well, a normal voltage of 230V must be supplied to the well, the electric pump must pass freely into the casing and be guaranteed to be submerged under water during operation.

Let's consider an example of choosing an electric pump for a cottage with a garden plot with a well, where a family of three lives and all the conditions described above already exist.

Let's say a well has the following passport data:

Casing pipe diameter -150 mm;
The total depth of the well is 40 m;
Well flow rate – 3 m3/h;
Static water level (distance from ground level to water surface) – 18 m;
Dynamic level (distance from the ground level to the water surface with constant operation of the submersible pump) – 25 m;
The distance from the well to the house is 10 m;
To automatically maintain pressure in the water supply system, it is planned to install a hydraulic accumulator with automation.
The average water consumption for a family of three is 1.8 m3/h, which is provided by the flow rate of the well, and is sufficient for the simultaneous use of four plumbing fixtures and for watering a personal plot.

The diameter of the casing pipe, flow rate, and total depth of the well allow the installation of “Aquarius” BTsPE 0.5 pumps.

When determining the total pressure of the electric pump, the following should be taken into account:

The total height difference from the installation point of the electric pump in the well to the uppermost consumer (in this case, to the hydraulic accumulator).
Pressure loss on a horizontal section of the pipeline (calculated as the ratio of 5 m of horizontal section to 1 m of vertical section).
For normal operation of the hydraulic accumulator with the function of maintaining water pressure, an additional pressure of about 30 m is required.
In accordance with the operating manual, the pump can be installed at least 15 m (immersed 10 m to a depth of 28 m) from the static water level in the well
Therefore, the total pressure is:

H=28+10/5+30=60m.

Where:

28 m - height from the pump installation level in the well to the hydraulic accumulator;
10 m - length of the horizontal section;
5 – coefficient that determines the pressure loss when supplying water through a horizontal section of the water pipeline;
30 m - pressure to create pressure in the water supply system and ensure operation of the pressure switch together with the hydraulic accumulator;
To select the AQUARIUS pump with a capacity of 0.5 l/sec (1.8 m3/h):

The choice is made according to the graph of the pressure characteristics of the AQUARIUS BTsPE 0.5 pumps (see Figure No. 1). Knowing the total pressure H = 60 m, we draw a horizontal straight line (dashed line) from the point - 60 m on the H axis until it intersects with the pressure characteristics curves and select the one closest in performance to the value Q = 1.8 m3/h.

Figure No. 1. The pressure characteristic of the Aquarius pumps BTsPE is 0.5. In this case, it will be an electric pump “Aquarius” BTsPE 0.5-63U*, which will ensure the supply of a sufficient volume of water and the operation of automation to create constant pressure in the cottage’s water supply network.