Like all grill types, the temperature range on a gas grill is naturally limited. The “low” setting on a gas grill is limited by the lowest flow rate that can prevent flashback. The “high” setting on the other hand is constrained by the burner’s ability to prevent flame lift or undesirable combustion outputs like carbon monoxide.
According to a patent filed by Weber, they’re working on a way around that with a dual-burner assembly setup. It would give their gas grills a lower “low” for smoking and simmering and a higher “high” for anywhere searing capabilities.