When sourcing a heavy oil burner, you must prioritize thermal power output (kW/kcal) to ensure it meets your boiler or furnace requirements. Key technical factors include the atomization method (pressure atomization vs. air/steam atomization), as heavy oil requires high-pressure or auxiliary media to break down viscosity. Ensure the burner features a pre-heating system with precise temperature control, as heavy oil must be heated to 90°C–120°C to achieve the correct viscosity for combustion. Additionally, verify the turndown ratio (e.g., 1:5) to ensure operational flexibility and energy efficiency during low-load periods.