Introduction: High-pressure spray guns are not something that can be purchased casually; choosing the wrong one can damage the vehicle and lead to wasted time. Power, water pressure, flow rate, and nozzle design all impact the performance. For home use, a 2000W power and 120-200 Bar water pressure is sufficient, but for commercial use, higher specifications are required. Complete accessories, self-priming function, and durable materials are essential features to consider when making a purchase.