Moen Smart Shower 4-Outlet Digital Thermostatic Shower Valve S3104

In this review of the Moen Smart Shower 4-Outlet Digital Thermostatic Shower Valve S3104, the bottom line is simple: this valve is for homeowners and installers who want precise, repeatable temperature control and flexible plumbing connections for a smart shower build. The valve's TEMPERATURE CONTROL thermostatic mechanism keeps shower temperature steady once set, and the compact design plus a 30-ft data cable makes it practical for modern remodels. It is most compelling when paired with Moen digital controllers for a fully programmable experience, though the controller is sold separately.

Key Features

• ExactTemp thermostatic valve: Maintains a consistent preset temperature so showers do not swing hot or cold during use.
• 4-outlet smart compatibility: Designed to work with U by Moen 4-outlet digital controllers (sold separately) to enable smart home shower control.
• 3/4 in connections: 3/4 in CC inlet and outlet ports provide standard plumbing compatibility for durable supply and fixture hookups.
• Compact and flexible installation: Fits in a standard 2x4 wall and the 30-ft data cable gives installation flexibility for controller placement.
• Two-outlet customization: Allows routing to two fixtures so users can combine a showerhead and hand shower or other paired fixtures.
• Built to last: Digital components carry a 5-year warranty to protect against early failures.

Who It's For

The S3104 is aimed at homeowners renovating bathrooms who want precise temperature control and the option to add a smart digital interface later, and for professional plumbers who need a compact thermostatic valve that fits standard framing. It is particularly useful when building a multi-fixture shower that will later be controlled by Moen's digital controllers.

Those who should look elsewhere include buyers who need a complete smart shower out of the box; the digital controller is not included and must be purchased separately. Also, if Wi-Fi or power-saving display behavior is a primary concern, reviewers have reported intermittent controller/display power issues when paired with other components.

Pros & Cons

Pros

• Responsive temperature control through ExactTemp for consistent showering comfort.
• Standard 3/4 in CC connections simplify integration with common plumbing systems.
• Compact form factor and long data cable make placement and installation flexible.
• Five-year warranty on digital components provides added peace of mind.

Cons

• Controller is sold separately, so this valve is not a complete smart shower solution by itself.
• Some customers report mixed functionality and occasional power/display issues when used with controllers.

Specifications

Our Verdict

The Moen S3104 valve is a solid choice for anyone building a smart-capable shower who values accurate thermostatic control and flexible installation. It represents good value when paired with Moen digital controllers, but buyers should budget for the separate controller and be aware of occasional reports of controller power or display issues.

Frequently Asked Questions

Does the valve include the digital controller?
No. The digital controllers for a full smart shower experience are sold separately and are required to use the system's advanced features.

What pipe size does it use?
The valve uses 3/4 in CC inlet and outlet connections for standard plumbing hookups.

Can it fit in standard wall framing?
Yes. The compact design fits a standard 2x4 wall and includes a 30-ft data cable for flexible controller placement.