When evaluating ovens, prioritize heating consistency and energy efficiency. For electric models, ensure the heating elements are made of Incoloy or high-grade stainless steel to prevent corrosion. For gas ovens, verify the electronic ignition systems and flame failure safety devices. Pay close attention to insulation thickness (minimum 50mm high-density rock wool) to reduce heat loss and external surface temperature. Additionally, check for PID temperature controllers which offer precision within ±1°C, essential for professional baking and roasting.