When selecting a gas steam iron, you must prioritize steam pressure stability and heating efficiency. Look for units with a working pressure of 0.3-0.5 Mpa to ensure consistent wrinkle removal. The soleplate material should be hard-anodized aluminum or high-grade stainless steel to prevent snagging and ensure even heat distribution. Additionally, verify the gas consumption rate (typically measured in kg/h) to calculate long-term operational costs, and ensure the ignition system is a high-quality electronic pulse ignition for safety and reliability.