Moen Flo 3/4-inch Smart Water Shut Off Valve, Smart Home Water Monitor Leak Detector
Quick take
Moen Flo combines a flow/pressure monitor with an automatic shutoff valve on the main water line, sending real-time alerts and letting you control water remotely in the Moen Smart Water Network App. It’s best for people who want whole-home protection, especially second homes, rentals, or homes where you’re often away, but it requires professional-level plumbing considerations and your app expectations should focus more on alerts than long-term history.
Pros and cons
Pros
- Automatic shutoff when abnormalities are detected, helping limit damage from leaks or catastrophic events.
- Real-time notifications (app plus phone call and email alerts) for potential leaks and other water issues.
- App control for viewing live usage (flow rate, pressure, and temperature) and shutting off remotely.
- Designed to learn your household water patterns to identify unusual running water and small leaks.
Cons
- Installation is plumbing-intensive; professional installation is recommended and electrical considerations may apply depending on placement.
- App history visibility may be limited (some users report only short windows like hourly for the current day and weekly for the current week).
- Reports of reliability issues exist over time (review evidence is limited but present), so it’s important to treat it like a major system component, not a disposable gadget.
- Specific pipe-size fit matters (model 900-001 targets 3/4-inch to 1-1/4-inch pipe diameters).
What buyers think
Buyer feedback centers on practical, day-to-day value: getting alerts quickly, seeing live flow/pressure/temperature data, and the peace of mind that comes with whole-home shutoff capability. Many users describe an initial learning/setup period and then regular access to usage insights and notification triggers (such as fixtures being left on). Reviews also commonly mention that installation often isn’t plug-and-play, some people are able to install with basic skills, but professional support is a frequent theme. A smaller set of feedback discusses app history limitations, and a limited number of users report that remote shutoff stopped working years later, including internal water intrusion after a period of time.
How Moen Flo works for leak detection and shutoff
Moen Flo installs on the main supply line, where it can monitor the household’s water behavior continuously. Instead of relying only on isolated sensors, it uses flow sensing to help detect running water and abnormal usage patterns. The system is designed to automatically turn the water off when it identifies a potential issue, with the goal of reducing damage if you can’t respond immediately.
Beyond leaks, Flo is also intended to watch for other water-related risks such as high water pressure and freezing conditions, and it can alert you if it detects that a fixture appears to have been left running.
Notifications, app control, and live water data
The core benefit buyers look for is rapid awareness. Flo sends real-time notifications through the Moen Smart Water Network App, with additional alert pathways that can include phone call and email notifications. That matters for vacation scenarios or situations where you might not notice water sounds right away.
In the app, you can view live metrics like water flow rate, pressure, and temperature. This can be useful for understanding what the system considers normal in your home, especially after an initial learning period, so you can better interpret alerts.
One buying caveat that comes up in reviews is how much historical data you can actually access. Some users report that the app’s history view can be limited to short windows (for example, hourly data for the current day and weekly data for the current week), which may not satisfy anyone hoping to generate long-term trends or deep dive analyses.
Installation reality: plan for plumbing and possible electrical work
Flo is a main-line valve system, so installation affects the entire home’s water path. Professional installation is recommended, and reviews reflect that it often involves more than just mounting a sensor. Depending on where the device is installed and how your power needs are handled, electrical work (such as an outdoor/waterproof junction box when installed outside) may be part of the project.
Fit also matters: the Moen Flo model 900-001 is designed for 3/4-inch to 1-1/4-inch pipe diameter. If your main supply plumbing doesn’t fall within that range, you’ll need to confirm compatibility before buying.
Smart home compatibility and remote shutoff
Flo is built to integrate with popular smart home ecosystems. It’s compatible with Alarm.com, Ring, Google Assistant, and NICE, which can help align notifications and automation with devices you already use. The system is also designed to support remote control from anywhere using the Moen Smart Water Network App.
Note that Wi‑Fi connectivity loss doesn’t necessarily remove protection, the system stores recent learnings locally to keep safeguarding until the connection is restored. That’s helpful if your internet occasionally goes down.
Pros and cons for different buyers
Best for
- Second-home owners and renters who want automatic shutoff if something goes wrong while they’re away.
- Households with a history of leaks or homes with plumbing types that make repair complexity higher.
- People who want whole-home monitoring on the main line, not just room-level detection.
- Buyers who value immediate alerts and the ability to remotely shut off water.
Potentially not ideal for
- Anyone expecting a quick DIY weekend project, installation and setup are more involved than plug-in detectors.
- Shoppers who primarily want detailed, long-term water analytics inside the app.
- Homes where the main-line pipe size doesn’t match the model’s 3/4-inch to 1-1/4-inch range.
Verdict: is Moen Flo worth it?
Moen Flo is a strong fit if you’re shopping for whole-home smart water protection and you want the system to react automatically, not just alert you. Buyers value the combination of real-time alerts, live usage visibility, and remote/app shutoff capability, especially for properties where nobody is always home. The main tradeoffs are installation complexity and the fact that app history may not go as deep as some users expect. If you’re prepared for those realities and want main-line shutoff protection, it’s a compelling option in the smart water monitor category.
Price and availability
Moen Flo is an active, in-stock item in the US market at the time of writing, with pricing that can vary by retailer. Check the latest listing for current availability and the most up-to-date cost.
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Buy on AmazonFAQ
Does Moen Flo shut off the water automatically?
Yes. The system is designed to detect unusual water usage patterns and potential water issues and can automatically turn off the water to help prevent or limit damage.
What notifications does it send?
Flo provides real-time notifications through the Moen Smart Water Network App, and it can also alert you via phone call and email for potential leaks or abnormal water activity.
How does the learning process work?
Flo monitors your household water use and is designed to learn normal usage patterns so it can identify abnormalities like running water or small leaks. Reviews often mention an initial period before the system becomes familiar with typical behavior.
Is the installation difficult?
Professional installation is recommended. Reviews commonly point out that it’s more involved than mounting a typical sensor because it’s installed on the main water line and may require electrical planning depending on placement.
What pipe sizes does model 900-001 fit?
Model 900-001 is intended for 3/4-inch to 1-1/4-inch pipe diameter.
Will it still protect my home if Wi‑Fi goes out?
The device is designed to continue safeguarding by storing the latest learnings locally, then resuming full performance once Wi‑Fi is restored.
Is there a subscription fee for the app?
The app is intended to be free to use, with no subscription fees required.
How far back can I view water history in the app?
App history depth can be limited. Some buyers report access that’s focused on short windows (such as hourly for the current day and weekly for the current week), so it may not replace a long-term analytics tool.
Can I integrate it with other smart home platforms?
Flo is compatible with Alarm.com, Ring, Google Assistant, and NICE.
Specifications
| Product Title | Moen Flo 3/4-inch Smart Water Shut Off Valve, Smart Home Water Monitor Leak Detector, Wifi Connected, App Enabled Flow Meter and Shutoff, 900-001 |
|---|---|
| Category | Tools & Home Improvement > Safety & Security > Household Sensors & Alarms > Water Detectors & Alarms |
| Brand | Moen |
| Manufacturer | Moen Incorporated |
| Model Number | 900-001 |
| Color | Blue |
| Size | 3/4 inch |
| Item Weight | 4.8 Pounds |
| Product Dimensions | 10.98"L x 10.55"W x 5.59"H |
| Power Source | AC |
| Compatible Devices | Smartphone, Tablet |
| Battery Description | CR123A 3-volt lithium metal battery |
| Number of Batteries | 2 AA batteries required. |
| Voltage | 12 Volts |
| Control Method | Voice |
| Mounting Type | Wall Mount |
| Sensor Technology | Ultrasonic Sensor |
| Smart Home Compatibility | Smart Home Compatible |
| Item Dimensions L x W x H | 10.98"L x 10.55"W x 5.59"H |
| UPC | 860000103503 |
| Global Trade Identification Number | 00860000103503 |
| Manufacturer Warranty Description | 1-Year Warranty |
| Mfr Part Number | 900-001 |
| Unit Count | 1.0 Count |
| Item Type Name | Smart Water Monitor and Automatic Shutoff Sensor, Wi-Fi Connected Water Leak Detector For 3/4-Inch Diameter Pipe |
| Built-In Media | Allen wrench/Hex Key, Leak Detection System, O-rings, Power Adapter, Spacers, Threaded tailpieces |
Available variants
Style
- Smart Water Shutoff Valve
Size
- 1 Inch
- 3/4 inch
- 1.25 Inch
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