What is the wattage of the ghd hairdryers? September 23, 2019 09:16 Updated Our most powerful hairdryer is the ghd air® with a wattage of 1600w. Related articles ghd flight® travel hair dryer Can I use my ghd product outside of the US? What is the difference between the ghd hair dryers? ghd air® hair dryer Which hairdryer can I use the air diffuser with?