When evaluating Lorentz solar pumps, you must prioritize system efficiency and motor technology. Ensure the distributor provides pumps with ECDRIVE brushless DC motors, which offer significantly higher efficiency than traditional AC motors. Verify the Total Dynamic Head (TDH) and flow rate (m³/h) requirements against the specific pump controller model (e.g., PS2-150 to PS2-4000 series). Additionally, confirm that the data logging and management software (PumpScanner & LORENTZ Global) is included, as this is critical for remote monitoring and performance optimization.