Head (height): How high do you need water delivered? If your house or tank is high, or lifting from deep down, you’ll need enough head (meters). The 28 m head means up to that vertical lift.
Flow rate (L/min or m3/hr): How many liters per minute you want. Higher flow means more volume delivered. The ~300 L/min listed is relatively strong.
Power source: Electric vs petrol vs diesel. The one in your description is likely electric. Electric is cheaper to run if you have reliable electricity; petrol or diesel may be used if off‐grid but require maintenance and fuel.
Voltage / single vs three phase: If electric, make sure your supply matches. Single‐phase 220-240V is common in homes, but some high-HP pumps may require three phase.