When comparing prices, you must look beyond the sticker cost and evaluate Flow Rate (m³/h) and Head (m). A higher price often reflects a high-pressure capability or a large-diameter discharge. Ensure the engine is a reputable brand (e.g., Ricardo, Cummins, or high-quality Chinese brands like Weichai), as the engine accounts for 60-70% of the total unit cost. Additionally, check if the pump features a self-priming function and a mechanical seal made of silicon carbide, which increases durability in sandy water conditions.