What is turn down ratio of furnace burner?

The turn down ratio of a furnace burner refers to the range of operating capacities that the burner can efficiently modulate, typically expressed as a ratio of maximum to minimum output. For example, a burner with a turn down ratio of 10:1 can operate effectively at 100% capacity down to 10% capacity. This capability allows for better control of combustion and energy efficiency, especially during varying load conditions. A higher turn down ratio generally means improved efficiency and flexibility in maintaining desired temperatures.