Do the math. In order to decide how many sprays you can run at once, you must do some basic math.
Plumbing codes mandate standard heads and body sprays to be fitted with flow restrictions, allowing 2.2 gallons of water per minute, (about half of this is hot water).
Depending on your PSI, or water pressure, a 3/4" thermostatic valve can handle approximately 13-16 gallons of water per minute.
You can operate up to five fixtures on one 3/4" thermostatic mixer at once. Most valves this size will set the temperature only and will require separate volume controls in the form of wall valves. A thermostatic mixing valve allows you to control the volume and temperature separately. Similar to thermostatic valves, volume controls can also be found in 1/2" and 3/4" valve sizes. How you organize the volume controls is up to you. You might run three body sprays on one volume control, or you might choose to run one showerhead on one volume control.
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