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- Best overall: Moen Flo Smart Water Monitor and Shutoff (1-Inch)
- Best budget: Phyn Smart Water Sensor
- Best premium: Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation)
- Best for room-level leak alerts: Moen Smart Water Detector (920-004)
- Moen Flo Smart Water Monitor and Shutoff combines automatic leak detection with app-based water monitoring and shutoff.
- Phyn Plus Smart Water Assistant + Shutoff tracks water flow 240 times per second and offers automatic shutoff.
- Choose a model by matching its connection size to your home’s plumbing and checking installation requirements.
- Moen Smart Water Detector and Phyn Smart Water Sensor add leak alerts without replacing a whole-home shutoff.
- Compare each product’s monitoring, installation needs, and app features before choosing a Black Friday 2026 pick.
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff are two whole-home systems that monitor water flow and can shut off a home’s supply when they detect a serious leak. We researched and compared specs, reviews and owner feedback to help shoppers choose between them for Black Friday 2026.
The best match depends on your pipe size, preferred app features, installation plans, and whether automatic shutoff is essential. Our Best bet for broad leak protection is a correctly sized Moen Flo or Phyn Plus system; standalone sensors from both brands suit shoppers who want room-level alerts instead.
How We Picked
- Compared each product’s stated leak-monitoring and automatic-shutoff functions.
- Checked listed pipe connection sizes and considered how sizing affects installation fit.
- Reviewed product specifications, owner feedback, app features, and alert options.
- Included standalone sensors for shoppers who want leak alerts without a whole-home valve.
- Prioritized products with clear use cases for different home plumbing setups and needs.
Comparison Table
| Product | Best for | Pipe connection | Monitoring | Automatic shutoff |
|---|---|---|---|---|
| Moen Flo Smart Water Monitor and Shutoff (1-Inch) | Homes with a 1-inch connection | 1 inch | Whole-home flow | Yes |
| Moen Flo Smart Water Monitor and Shutoff (3/4-Inch) | Homes with a 3/4-inch connection | 3/4 inch | Whole-home flow | Yes |
| Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch) | Homes with a 1-1/4-inch connection | 1-1/4 inches | Whole-home flow | Yes |
| Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation) | Frequent flow readings with a 1-inch connection | 1 inch | 240 readings per second | Yes |
| Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation) | Frequent flow readings with a 3/4-inch connection | 3/4 inch | 240 readings per second | Yes |
| Phyn Smart Water Sensor | Local leak alerts | No pipe connection | Local detection | No |
| Moen Smart Water Detector (920-004) | Local leak alerts | No pipe connection | Local detection | No |
Best Picks Reviewed
#1 · Top pick
Moen Flo Smart Water Monitor and Shutoff (1-Inch)
The Moen Flo Smart Water Monitor and Shutoff (1-Inch) is the best whole-home pick for owners with a matching 1-inch connection who want automatic leak monitoring and shutoff. The Moen Flo Smart Water Monitor and Shutoff (1-Inch)'s daily automatic system health test adds a useful check-in.
Best for: Homes with a 1-inch pipe connection seeking whole-home monitoring.
- Pipe connection
- 1 inch
- System health check
- 1 daily test
- Monitoring
- Whole-home water flow
- Shutoff
- Automatic valve
- Tracks water use through a connected app.
- Can shut off water when the system identifies a serious leak.
- Daily health checks help keep system status visible.
- Requires a compatible 1-inch connection and plumbing installation.
Is the Moen Flo Smart Water Monitor and Shutoff (1-Inch) worth buying on Black Friday 2026?
The Moen Flo Smart Water Monitor and Shutoff (1-Inch) is worth considering for a home with a matching pipe connection and a need for whole-home leak protection. The system offers app-based monitoring, automatic shutoff, and 1 daily health test.
See today’s Black Friday price on Amazon
#2
Moen Flo Smart Water Monitor and Shutoff (3/4-Inch)
The Moen Flo Smart Water Monitor and Shutoff (3/4-Inch) is the best fit for homeowners with a 3/4-inch connection who want app-based monitoring and automatic leak shutoff. The Moen Flo Smart Water Monitor and Shutoff (3/4-Inch)'s daily health test provides 1 regular system check.
Best for: Homes with a 3/4-inch pipe connection.
- Pipe connection
- 3/4 inch
- System health check
- 1 daily test
- Monitoring
- Whole-home water flow
- Shutoff
- Automatic valve
- Pairs whole-home flow monitoring with a shutoff valve.
- Sends system information through the connected app.
- Daily health testing helps show system status.
- Installation requires a compatible 3/4-inch connection.
Is the Moen Flo Smart Water Monitor and Shutoff (3/4-Inch) worth buying on Black Friday 2026?
The Moen Flo Smart Water Monitor and Shutoff (3/4-Inch) is a practical option for a home with matching plumbing that needs automatic leak protection. App-based monitoring, automatic shutoff, and 1 daily health test are its core features.
See today’s Black Friday price on Amazon
#3
Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch)
The Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch) is the best Moen option for a compatible 1-1/4-inch main line and whole-home leak monitoring. The system performs 1 daily health test and includes an automatic shutoff valve.
Best for: Homes with a compatible 1-1/4-inch main line.
- Pipe connection
- 1-1/4 inches
- System health check
- 1 daily test
- Monitoring
- Whole-home water flow
- Shutoff
- Automatic valve
- Covers whole-home water flow instead of a single fixture.
- App access supports remote monitoring.
- Automatic shutoff adds a response to detected problems.
- Pipe size and installation access need careful checking.
Is the Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch) worth buying on Black Friday 2026?
The Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch) is worth a look for homes with a matching main-line connection. The Moen Flo Smart Water Monitor and Shutoff (1-1/4-Inch) combines whole-home monitoring, app access, automatic shutoff, and 1 daily system health test.
See today’s Black Friday price on Amazon
#4
Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation)
The Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation) is the best pick for owners with a 1-inch connection who want detailed flow monitoring and automatic shutoff. The Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation) monitors water flow 240 times per second.
Best for: Homes with a 1-inch connection seeking frequent flow monitoring.
- Pipe connection
- 1 inch
- Flow monitoring
- 240 readings per second
- Monitoring
- Whole-home water flow
- Shutoff
- Automatic valve
- Frequent flow readings support detailed monitoring.
- Combines water monitoring and an automatic shutoff valve.
- App notifications help keep water activity visible.
- Requires compatible plumbing and installation planning.
Is the Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation) worth buying on Black Friday 2026?
The Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation) is a strong choice for a home with a matching connection and a need for whole-home protection. The Phyn Plus Smart Water Assistant + Shutoff (1-Inch, 2nd Generation)'s 240 readings per second support detailed flow monitoring alongside automatic shutoff.
See today’s Black Friday price on Amazon
#5
Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation)
The Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation) is the best fit for a 3/4-inch main line when frequent monitoring and automatic shutoff are priorities. The Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation)'s 240 flow readings per second provide detailed water-use tracking.
Best for: Homes with a 3/4-inch connection that want detailed monitoring.
- Pipe connection
- 3/4 inch
- Flow monitoring
- 240 readings per second
- Monitoring
- Whole-home water flow
- Shutoff
- Automatic valve
- Combines whole-home monitoring with an automatic valve.
- Provides 240 flow readings per second.
- App features help track water activity and alerts.
- The plumbing connection and installation requirements need checking.
Is the Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation) worth buying on Black Friday 2026?
The Phyn Plus Smart Water Assistant + Shutoff (3/4-Inch, 2nd Generation) is worth considering when a home has a compatible 3/4-inch line. The system monitors flow 240 times per second and pairs that detail with automatic water shutoff.
See today’s Black Friday price on Amazon
#6
Phyn Smart Water Sensor
The Phyn Smart Water Sensor is the best simple alert pick for shoppers who want to monitor a specific room without adding a whole-home valve. The Phyn Smart Water Sensor's 1 sensor unit detects water where it is placed and sends alerts through the app.
Best for: Room-level leak alerts without automatic whole-home shutoff.
- Sensor count
- 1 sensor
- Coverage
- Local water detection
- Alerts
- App notifications
- Shutoff
- No whole-home valve
- Adds leak detection near appliances or plumbing fixtures.
- Does not require replacing a home’s main water valve.
- App alerts keep a detected leak visible.
- Does not automatically shut off the home’s water supply.
Is the Phyn Smart Water Sensor worth buying on Black Friday 2026?
The Phyn Smart Water Sensor is a worthwhile option for shoppers who want a focused leak alert near a fixture or appliance. The Phyn Smart Water Sensor's 1 sensor detects local water and sends app alerts, but it does not provide whole-home automatic shutoff.
See today’s Black Friday price on Amazon
#7
Moen Smart Water Detector (920-004)
The Moen Smart Water Detector (920-004) is the best room-level alert choice for shoppers who want to monitor a leak-prone spot without installing a whole-home shutoff. The Moen Smart Water Detector (920-004)'s 1 detector helps flag water near appliances, plumbing, or a basement floor.
Best for: Local leak detection around appliances and plumbing.
- Detector count
- 1 detector
- Coverage
- Local water detection
- Alerts
- App notifications
- Shutoff
- No whole-home valve
- Targets areas where leaks start, such as near a water heater.
- Offers an alternative to installing a main-line valve.
- App alerts help notify owners of detected water.
- Does not automatically shut off the main water supply.
Is the Moen Smart Water Detector (920-004) worth buying on Black Friday 2026?
The Moen Smart Water Detector (920-004) is a useful choice for local leak alerts near a fixture, appliance, or other risk area. The Moen Smart Water Detector (920-004)'s 1 detector flags water and sends alerts, but whole-home automatic shutoff requires a separate system.
See today’s Black Friday price on Amazon
Which is better, Moen Flo or Phyn Plus?
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff each pair whole-home monitoring with an automatic valve, so the right choice depends on your priorities and pipe fit. Both are designed to help identify unusual water activity and limit damage by stopping the supply.
Phyn Plus Smart Water Assistant + Shutoff tracks flow 240 times per second, a clear specification for shoppers who value frequent readings. Moen Flo Smart Water Monitor and Shutoff offers a daily automatic system health test and app-based monitoring. Neither feature alone decides the winner: compare the app experience, installation plan, and support needs for your home.
Easy recommendation: start with the plumbing connection size, then compare the features you expect to use. A matching model with an installation plan is a better purchase than a feature-rich system that does not fit.
What is the difference between Moen Flo and Phyn Plus?
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff both monitor whole-home water flow and can close a connected valve, but their stated monitoring details differ. Phyn Plus lists 240 flow readings per second; Moen Flo highlights a daily system health test.
Both product families connect to an app for monitoring and alerts. The practical distinction for many shoppers is how each system presents water activity and what plumbing setup is needed for installation. Check the exact product variant against the main-line connection before choosing, since the models in this guide have different pipe-size options.
Standalone products fill a different role. Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) focus on local water alerts, rather than monitoring the whole home or automatically shutting off the main supply.
Do Moen Flo and Phyn Plus shut off water automatically?
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff both include automatic shutoff valves designed to respond when their systems identify a serious leak. The automatic valve is a key difference from standalone sensors, which alert users but do not control a home’s main water supply.
Automatic shutoff can add a layer of protection when a homeowner is away or does not see an alert right away. Owners should still review the app settings, understand system alerts, and follow the product’s installation instructions. Correct fit and proper installation matter for both monitoring and valve operation.
Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) work as room-level alert devices. Choose either sensor when local notifications are the priority; choose a compatible Flo or Phyn Plus valve when automatic whole-home shutoff is part of the goal.
Which pipe size should I choose for a smart water shutoff?
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff must match the home’s plumbing connection, so check pipe size before ordering. This guide includes 3/4-inch and 1-inch options for both product lines, plus a 1-1/4-inch Moen Flo option.
Confirm the size at the planned installation point rather than assuming it from a fixture or an old product listing. A licensed plumber can help identify the connection and assess the available installation space. Also review each product’s included fittings and installation requirements before checkout.
A smart water sensor has no main-line connection size because it sits near a potential leak source. Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) are easier to compare by placement and alert needs, not by pipe diameter.
Are standalone water leak sensors enough protection?
Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) provide local alerts, while Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff add whole-home monitoring and automatic shutoff. Each type suits a different level of protection.
A standalone sensor is a straightforward option for a laundry area, water heater, sink cabinet, or other leak-prone location. The alert can help an owner respond, but the sensor does not close the main valve. Placement matters: put the unit where leaking water reaches it, and keep app notifications available.
For a broader response, a compatible shutoff system monitors water flow through the home and controls a valve. Some owners pair a main-line system with room-level sensors to cover both whole-home flow and specific leak locations.
Buying Guide
Match the pipe connection first
Confirm the size of the main-line connection where the system will be installed. Compare that measurement with the exact Moen Flo or Phyn Plus variant, and consult a plumber if the connection or installation space is unclear.
Choose automatic shutoff or local alerts
Moen Flo and Phyn Plus include a whole-home valve. Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) offer local detection and app alerts without automatic main-line shutoff.
Compare the monitoring details
Phyn Plus specifies 240 flow readings per second, while Moen Flo highlights 1 daily system health test. Review the app features and alerts that matter to your household before choosing.
Plan for installation
Whole-home shutoff products connect to plumbing and require a suitable installation location. Check installation instructions, included components, and whether professional plumbing help fits your plan.
Shop the exact variant on Black Friday
Compare the full product name, pipe size, included features, seller, and return terms before checkout. Similar product names can refer to different connection sizes or sensor-only devices.
FAQ
Moen Flo vs Phyn Plus: which is better for Black Friday 2026?
Moen Flo Smart Water Monitor and Shutoff is a strong match for shoppers who value its daily system health test and app monitoring. Phyn Plus Smart Water Assistant + Shutoff stands out with 240 flow readings per second. Choose based on pipe fit, installation plans, and preferred monitoring details.
Does Phyn Plus monitor water flow continuously?
Phyn Plus Smart Water Assistant + Shutoff monitors water flow at 240 readings per second, according to its product specifications. The system also supports app-based monitoring and automatic shutoff. Confirm the selected pipe-size variant and installation requirements before buying.
Does Moen Flo automatically shut off water?
Moen Flo Smart Water Monitor and Shutoff includes an automatic valve designed to shut off water when the system identifies a serious leak. The product also offers app-based monitoring and 1 daily system health test. Correct sizing and installation are essential.
Do Moen Flo or Phyn Plus need professional installation?
Moen Flo Smart Water Monitor and Shutoff and Phyn Plus Smart Water Assistant + Shutoff connect to a home’s plumbing, so installation involves the main water line. Review each model’s instructions and connection size. A licensed plumber is a sensible choice when plumbing work is outside your experience.
Can a Phyn or Moen leak sensor shut off the main water?
Phyn Smart Water Sensor and Moen Smart Water Detector (920-004) provide local leak detection and alerts, but neither includes a whole-home shutoff valve. For automatic main-line shutoff, choose a compatible Moen Flo Smart Water Monitor and Shutoff or Phyn Plus Smart Water Assistant + Shutoff.