How big should a showerhead be? The folks at Trendir suggest this Hansgrohe Downpour Air Royale that is as wide as your shoulders. The showerhead is a 14-inch circle with 225 spray channel. It also has an air injection feature that makes the shower feel more like a gentle rain than a water assault. And it even self-cleans. The showerhead sells for around $980 and is available next month.