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The rise of the multiheaded custom shower, or "vertical spa," proves once again that two heads are better than one — and, further, that six heads are unbelievably great. Odds are good that you'll be discussing this kind of shower as an upgrade with a client sooner or later. When you do, keep in mind that you can't simply modify an existing shower by adding more heads; custom showers require fundamental plumbing changes. When it comes to equipping a multihead shower, there are just a few too many choices to keep things simple.
They're called spray heads for a reason: Feeble, drooling shower nozzles are not the objective here. So adequate water pressure is a basic requirement — manufacturers recommend 45-psi minimum pressure, with 50 psi preferred for optimal performance.