To choose a downhole pump, you need to:
Find out the debit of your well. In the passport in the well must be specified. Based on the debit, you will determine the maximum pump capacity (m3 / h)
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Also, from the passport, specify the inner diameter of the well, hence determine the maximum diameter of the pump.
Find out what kind of pressure you need. To do this, you need to add: the depth of the well from which the pump will lift water + the height of the rise above ground level + the pressure loss along the length of the pipe+ the pressure in the pipeline, for normal use should be ~ 30 m of water. post's.
You also need to know what voltage you have. 3x or 1 phase.
Eg
There is a slit of 100 mm, flow of water plan 3 sq m/h, drill depth 85 meters, the water necessary to raise it to the second floor are 2*3=6метров, the distance from the well to the house 10 meters, the losses through the pipe, with 3 cubic meters/hour at 100 meters = 0.8 bar = 8 meters of water. post's. Total required pressure = 85+6+8+30 = 129 meters.

Next, the flow rate (3 cubic meters / h) and the head (129 meters) - determined. Now you should decide on the manufacturer, price and quality. I believe that you should not save money on the borehole pump.