Yes, one outlet can be used to fill a tub. An outlet icon on the controller can be changed to a tub spout if the app has be downloaded onto your phone and the controller is connected to the cloud/internet. This can be done in the "Settings" section of the Moen Smart Water App. Be aware that one outlet will produce a maximum of 6gpm at 45psi unrestricted on any one outlet, so this specification will need to be evaluated with the size of the tub in question.
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