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Moen 900-001 Flo Smart Water Monitor and Automatic Shutoff Sensor, Wi-Fi Water Leak Detector for 3/4-Inch Diameter Pipe

3.9 3.9 out of 5 stars 1,370 ratings

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Smart Water Shutoff
3/4 inch

Purchase options and add-ons

Color N/a Or Unfinished
Material Plastic
Brand Moen
Product Dimensions 6"D x 6"W x 3"H
Style Smart Water Shutoff

About this item

  • AUTOMATIC SHUTOFF: Learns your home’s water usage patterns to identify abnormalities like running water or small leaks and will automatically turn off water to prevent damage
  • REAL-TIME NOTIFICATIONS: The device monitors your home’s water, sending you app, phone call and email alerts for potential leaks whether you're at home or away
  • APP-BASED CONTROL: Proactively control your water from anywhere using the Smart Water App for added protection
  • OPTIMIZE: FloSense technology enhances the device’s security parameters and optimizes water savings by understanding the home’s water use and tailoring protection accordingly
  • INSTALLATION INFORMATION: Everything needed for installation is included in box, and professional installation is recommended
  • COMPATIBLE WITH: Moen water leak detectors for home are compatible with Amazon Alexa, Google Assistant, and Control4
  • SIZE: Model 900-001 fits 3/4-Inch to 1-1/4 Inch pipe diameter (consult a professional)
See more product details

Customer ratings by feature

WiFi signal
4.3 4.3
Value for money
4.2 4.2
Easy to install
3.6 3.6
Accuracy
3.3 3.3

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From the manufacturer

Moen Flo Smart Water Shutoff Valve

Protect Your Home from Leaks and Water Damage


The Flo Smart Water Monitor and Shutoff monitors the flow rate and pressure of your home’s water and detects leaks as small as a drop a minute — anywhere in your home. Plus, it can automatically shut off your water before a catastrophic leak occurs.

Secure Your Home's Water from Your Smartphone

Unmatched Whole Home Protection

Expand your protection by adding Smart Leak Detectors throughout your home. The detectors will alert you when and where they detect moisture and can automatically trigger your Shutoff to protect against water damage.

Moen Smart Water Security
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Moen Smart Water Network

Smart Water for a Smarter Home

The Moen Smart Water Network is a collection of smart home products, brought together in a single, integrated app, to give you unprecedented control over how you experience water in your everyday life. It's innovation that makes your life simpler, easier, and brings you peace of mind.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Moen

Moen 900-001 Flo Smart Water Monitor and Automatic Shutoff Sensor, Wi-Fi Water Leak Detector for 3/4-Inch Diameter Pipe


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Product guides and documents

Product Description

Bring smart plumbing to your Home with Flo by Moen. This Smart Home system is the first water security system that monitors and protects your home from leaks and water damage with a single device, no additional sensors needed. Designed by plumbing and tech industry professionals, Flo by Moen is installed on the main water supply line of the home. Through the Flo by Moen mobile app or your web browser, you can see live water use, including water flow rates, pressure and even temperature. If the device detects an issue (e.g. high pressure, freezing water or a small leak) it will alert you through the app so you can fix it before that issue causes damage. If there's a catastrophic failure, like a burst pipe or someone leaves the water running, you'll be alerted in the app allowing you to shut the water off no matter where you are.

Important information

Bulb Voltage

100240 volts

Customer reviews

3.9 out of 5 stars
3.9 out of 5
1,370 global ratings

Customers say

Customers like the ease of installation of the valve. However, some disagree on water usage, documentation, value, water shutoff, leakage, quality, and performance.

AI-generated from the text of customer reviews

105 customers mention84 positive21 negative

Customers find the installation of the valve to be super easy. They mention that the instructions are easy to follow, and the videos are great. Customers also appreciate the intuitive UI of the application, which provides actionable information.

"...It took less than an hour to install.Setup was simple and instructions were easy to follow...." Read more

"...Well, I opened the box and the instructions were easy, setting up and account with the app (I use an iPhone) and the app is excellent...." Read more

"...Installation was straightforward as I’m a reasonably plumber (DYI). My issue was it took 3 units to finally get it working...." Read more

"...They touted the ease of installation and raved about the mobile app and its ability to monitor water usage and detect all manner of water leaks...." Read more

189 customers mention94 positive95 negative

Customers are mixed about the performance of the valve. Some mention that it has worked great and seems to operate without flaw. They also feel it is very useful and provides an extra layer of protection. However, others say that it was nonfunctional for about 3 months and that the app is outdated and will not run on their Android system.

"...and opinion of the device is unchanged and I still feel it is very useful and provides an extra layer of protection for our home...." Read more

"...When I investigated, I noticed the wifi was down and water was dripping out of the power port on the unit. Im sure it wasnt supposed to do that...." Read more

"...It’s working and I’m happy to see such a quality device / App combo work so well and this is now by far the smartest and most useful smart device in..." Read more

"...determined there was no leak and it was, you guessed it, another faulty Flo device. Exasperated, she had the plumber remove the device from her home...." Read more

79 customers mention39 positive40 negative

Customers are mixed about the quality of the valve. Some mention that it's amazing, has a nice concept, and is impressive. However, others say that it has poor quality, the reports are highly inaccurate, and the design is inherently flawed. Some customers also mention that the 1 inch valve is a fraud and seems a bit flimsy.

"...The device is nice and seems to be made of quality...." Read more

"...In the end, caveat emptor. The device isn't cheap (especially as of April 2022)...." Read more

"Purchased Oct 2019, so about 2 years of use. The concept is great and initially I was very pleased...." Read more

"...It seems a bit flimsy as it is mostly plastic, but is ok so far...." Read more

72 customers mention35 positive37 negative

Customers are mixed about the water usage of the valve. Some mention that it helps them monitor and track water usage, while others say that it doesn't register any water usage.

"...it worked but less than a year into it I noticed it was no longer showing any water usage on the app...." Read more

"...I can easily monitor water usage via the mobile app, and the unit also runs a diagnostic check for leaks once a day in the late evening after..." Read more

"...Two weeks ago, it said it didn't register any water use. I thought it was odd, but figured it was an error...." Read more

"...However, it does learn the water use habits of the home and did not repeat this. It seems a bit flimsy as it is mostly plastic, but is ok so far...." Read more

66 customers mention26 positive40 negative

Customers are mixed about the value of the valve. Some mention that it's worth the cost, while others say that it was a waste of money. Some say that the product seems cheap and would not hold up in their application. Overall, opinions are mixed and the value is not recommended for a vacation home.

"...Maybe some day FloSense will have some sense. But right now, it’s nonsense." Read more

"...Fair price for a great job and peace of mind that it’s installed perfectly. See pictures. 30 minutes or so later and they were done...." Read more

"...they knew of the problem they replaced the unit but WOULD NOT PAY FOR THE REINSTALLATION!! So you're outta pocket for another plumber charge!" Read more

"...The water monitor was the best and least expensive option, even after paying a certified and licensed plumber to install it...." Read more

63 customers mention30 positive33 negative

Customers are mixed about the water shutoff. Some mention it's good at shutting off water, and easy to turn off to the whole house if a leak is detected. However, others say that it started shutting down while people were showering.

"...So every time it runs - the unit wants to shut off the water. We've tried what their Q&A debugging process recommended...." Read more

"...Can automatically shut off the water supply if a leak is detected.- Can monitor water usage and send alerts for unusual usage patterns.-..." Read more

"...i think it was a gear or something as it kept grinding and would not shut off) it was replaced under warranty free of charge by moen on year 2...." Read more

"...The other awesome thing was being able to turn the main water off and on from the bathroom when I had to replace the shutoff...." Read more

60 customers mention24 positive36 negative

Customers are mixed about the leakage of the valve. Some mention that the leak monitor tech seems very good, and it helps to detect a leaky toilet. However, others say that the small leak detection is not accurate, and the product is useless for detecting small leaks.

"...When I investigated, I noticed the wifi was down and water was dripping out of the power port on the unit. Im sure it wasnt supposed to do that...." Read more

"...water usage via the mobile app, and the unit also runs a diagnostic check for leaks once a day in the late evening after everyone is asleep...." Read more

"...has not physically malfunctioned (yet) as have many others, but not reporting leaks, and not seeming interested in fixing it when I call customer..." Read more

"...The leak was so slow it didn’t even register on the flow meter in the app except for a little blip every great once in awhile...." Read more

43 customers mention25 positive18 negative

Customers are mixed about the documentation of the valve. Some mention the UI is very intuitive and informative with colorful dashboards showing. They say the app is easy to use and provides actionable information. They also say the data that is collected is useful in making sure the home is secure. However, some customers feel the notifications do not have important information, the device doesn't learn, and machine learning algorithms are not magic. They are disappointed to learn that basic functionality reporting is lacking and has proven difficult to teach.

"...a quality device / App combo work so well and this is now by far the smartest and most useful smart device in the house.Support:..." Read more

"...Overall I give the system a 4 star rating because availability of historical data is quite limited and I'd like the ability to download detailed..." Read more

"...Can monitor water usage and send alerts for unusual usage patterns.- Can be controlled and monitored remotely via the Moen app...." Read more

"...Fourth: This not-so-smart device has caused me to baby sit it about 3/4 to 1 hour every day for three months, fixing the erroneous assigned event..." Read more

Piece of mind; worth the price and monthly fee
5 Stars
Piece of mind; worth the price and monthly fee
I've heard about these for a while and thought it would be a nice thing to have, but never actually bought one, until now. After our neighbor's house flooded for the second time I thought it might be a good idea to have this, since all of these houses were built by the same builder. If they're having that many problems it could be a matter of time before we do as well, as both times their house was severely damaged.I'm not a plumber but have basic skills and had no problems installing the Flo valve. I used a 2" nipple between the Flo and our water filter and a shark bite on the other side to connect into our PEX pipe that comes off the PRV. It took less than an hour to install.Setup was simple and instructions were easy to follow. It took an hour or so for it to realize that it was installed, and then took another week or so to 'learn' our usage habits. Right after installation I began getting real-time data on flow rate, pressure, temperature, and gallons used. The data is pretty cool, but historical data is extremely limited. In the app, you can only get hourly data for the current day and weekly data for the current week. On the website you can only view/download hourly data for the current and prior day, daily for current or past four weeks, and monthly for the past 12 months.We've had the Flo installed for just over two weeks now and had no problems with it. We subscribed to Flo Protect but thus far it still has not identified individual fixtures. A note on that; they say 'we need a couple weeks of data before we can identify fixtures.' I contacted support and they told me it's actually three weeks. I suggested to them that they change their messaging on that to manage expectations.I've seen quite a few people unhappy that they have to pay $5/mo for the Flo Protect plan after paying $400+ for the valve. I have no problem with paying for it. We pay $15/mo for our alarm monitoring after paying around 2k for our system to protect our home. Water can cause severe damage, so I'm good with paying $5/mo to monitor that since it's probably more likely to happen than a break in when you think about all the places plumbing could fail and the extent of damage it can cause. Sure, insurance will probably pay for most of the repairs, but as I sit here listening to them jack hammering up the hardwood floors a couple doors from me for the entire day and watch all the various work trucks coming and going, I think of the inconvenience of it all.Overall I give the system a 4 star rating because availability of historical data is quite limited and I'd like the ability to download detailed hourly or daily data for a large period of time into Excel to perform more detailed analysis. If the data was more available I'd give it a full 5 stars.Support through the water concierge chat is excellent but anything I've sent via e-mail has gone completely unanswered, so I recommend using the chat.Today I purposely left our kitchen faucet on at a trickle while I was eating lunch and they called my phone after around 30 minutes to alert me to long water duration. I also got an e-mail about it and an app notification, all of which gave me the option to turn off my water immediately or ignore it. They said if I did not respond they would shut it off in five minutes. I'm pretty sure if a pipe broke and a lot of water was flowing it would have alerted much faster, but I only left the faucet barely trickling.All things considered I think this is a great product and both it and the monitoring are worth it in my opinion.Update 3/8/2020Usage by fixture finally became available after a little over three weeks of use and I wanted to provide some information on this.My expectations were pretty low for this feature and thus far I would say they may have just barely met them. My thoughts on this are that it would be quite difficult to isolate usage to a particular fixture, since the only data points they could use to identify fixtures would be flow rate and duration and many things could have similar flow rates, not to mention overlapping usage (i.e. you flush the toilet, then go and wash your hands, washing machine could be running while you're taking a shower, multiple people using water, etc.) That being said, it has done a fairly good job in identifying faucets, toilets, and showers/baths, but not always correctly. It has not been able to isolate anything else, such as the washing machine, dishwasher, refrigerator, etc. You do have the ability to go in and reclassify an event but I'm not certain that it learns anything from that or not. I know I changed one it got wrong from faucet to shower/bath and later I looked and it had changed it back. When you look at the event details it only provides the time, duration, and gallons used. It would be extremely helpful if it also provided the flow rate, as that is one of the most useful data points in identifying what fixture may have been using water. I plan to make that suggestion and hope they'll consider implementing it. If I can accurately reclassify events and it actually learns from that then maybe it would get more accurate over time.My overall rating and opinion of the device is unchanged and I still feel it is very useful and provides an extra layer of protection for our home.Update 4/7/2020Upgrading my overall rating from 4 to 5 stars because they just added expanded access to historical data which was the one thing that I felt was lacking. You can now view data by day, week, month, year, and even by custom date range. Being able to view a custom range is helpful if you want to compare the Flo data to your water bill as you can set it to the same billing period.
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Top reviews from the United States

Reviewed in the United States on March 2, 2020
Style: Smart Water ShutoffSize: 3/4 inchVerified Purchase
Customer image
5.0 out of 5 stars Piece of mind; worth the price and monthly fee
Reviewed in the United States on March 2, 2020
I've heard about these for a while and thought it would be a nice thing to have, but never actually bought one, until now. After our neighbor's house flooded for the second time I thought it might be a good idea to have this, since all of these houses were built by the same builder. If they're having that many problems it could be a matter of time before we do as well, as both times their house was severely damaged.

I'm not a plumber but have basic skills and had no problems installing the Flo valve. I used a 2" nipple between the Flo and our water filter and a shark bite on the other side to connect into our PEX pipe that comes off the PRV. It took less than an hour to install.

Setup was simple and instructions were easy to follow. It took an hour or so for it to realize that it was installed, and then took another week or so to 'learn' our usage habits. Right after installation I began getting real-time data on flow rate, pressure, temperature, and gallons used. The data is pretty cool, but historical data is extremely limited. In the app, you can only get hourly data for the current day and weekly data for the current week. On the website you can only view/download hourly data for the current and prior day, daily for current or past four weeks, and monthly for the past 12 months.

We've had the Flo installed for just over two weeks now and had no problems with it. We subscribed to Flo Protect but thus far it still has not identified individual fixtures. A note on that; they say 'we need a couple weeks of data before we can identify fixtures.' I contacted support and they told me it's actually three weeks. I suggested to them that they change their messaging on that to manage expectations.

I've seen quite a few people unhappy that they have to pay $5/mo for the Flo Protect plan after paying $400+ for the valve. I have no problem with paying for it. We pay $15/mo for our alarm monitoring after paying around 2k for our system to protect our home. Water can cause severe damage, so I'm good with paying $5/mo to monitor that since it's probably more likely to happen than a break in when you think about all the places plumbing could fail and the extent of damage it can cause. Sure, insurance will probably pay for most of the repairs, but as I sit here listening to them jack hammering up the hardwood floors a couple doors from me for the entire day and watch all the various work trucks coming and going, I think of the inconvenience of it all.

Overall I give the system a 4 star rating because availability of historical data is quite limited and I'd like the ability to download detailed hourly or daily data for a large period of time into Excel to perform more detailed analysis. If the data was more available I'd give it a full 5 stars.

Support through the water concierge chat is excellent but anything I've sent via e-mail has gone completely unanswered, so I recommend using the chat.

Today I purposely left our kitchen faucet on at a trickle while I was eating lunch and they called my phone after around 30 minutes to alert me to long water duration. I also got an e-mail about it and an app notification, all of which gave me the option to turn off my water immediately or ignore it. They said if I did not respond they would shut it off in five minutes. I'm pretty sure if a pipe broke and a lot of water was flowing it would have alerted much faster, but I only left the faucet barely trickling.

All things considered I think this is a great product and both it and the monitoring are worth it in my opinion.

Update 3/8/2020

Usage by fixture finally became available after a little over three weeks of use and I wanted to provide some information on this.

My expectations were pretty low for this feature and thus far I would say they may have just barely met them. My thoughts on this are that it would be quite difficult to isolate usage to a particular fixture, since the only data points they could use to identify fixtures would be flow rate and duration and many things could have similar flow rates, not to mention overlapping usage (i.e. you flush the toilet, then go and wash your hands, washing machine could be running while you're taking a shower, multiple people using water, etc.) That being said, it has done a fairly good job in identifying faucets, toilets, and showers/baths, but not always correctly. It has not been able to isolate anything else, such as the washing machine, dishwasher, refrigerator, etc. You do have the ability to go in and reclassify an event but I'm not certain that it learns anything from that or not. I know I changed one it got wrong from faucet to shower/bath and later I looked and it had changed it back. When you look at the event details it only provides the time, duration, and gallons used. It would be extremely helpful if it also provided the flow rate, as that is one of the most useful data points in identifying what fixture may have been using water. I plan to make that suggestion and hope they'll consider implementing it. If I can accurately reclassify events and it actually learns from that then maybe it would get more accurate over time.

My overall rating and opinion of the device is unchanged and I still feel it is very useful and provides an extra layer of protection for our home.

Update 4/7/2020

Upgrading my overall rating from 4 to 5 stars because they just added expanded access to historical data which was the one thing that I felt was lacking. You can now view data by day, week, month, year, and even by custom date range. Being able to view a custom range is helpful if you want to compare the Flo data to your water bill as you can set it to the same billing period.
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170 people found this helpful
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Reviewed in the United States on April 12, 2022
Style: Smart Water ShutoffSize: 3/4 inchVerified Purchase
593 people found this helpful
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Top reviews from other countries

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McAlpine
5.0 out of 5 stars This thing rocks!
Reviewed in Canada on March 14, 2023
Style: Smart Water ShutoffSize: 1 InchVerified Purchase
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McAlpine
5.0 out of 5 stars This thing rocks!
Reviewed in Canada on March 14, 2023
Brilliant device. Found out that our sailing clubhouse is running an average of 84psi with high's of up to 92psi. Also found out we have a small leak (still have not located). Excellent software and installation is pretty straightforward as long as you are comfortable cutting into watermain. Only downside of software is that only one email address can be added. Would be nice to be able to send to multiple emails instead. Don’t forget that you will need ac power nearby, an easy way to mount powerpack and some connections to hook up to your pipe work.
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One person found this helpful
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Amazon Customer
5.0 out of 5 stars Flo Moen water safety controller
Reviewed in Canada on November 5, 2021
Style: Smart Water ShutoffSize: 3/4 inchVerified Purchase
3 people found this helpful
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Pedro Treviño
1.0 out of 5 stars App no disponible
Reviewed in Mexico on July 25, 2019
Style: Smart Water ShutoffSize: 3/4 inchVerified Purchase
20 people found this helpful
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Amazon Customer
5.0 out of 5 stars Peace of Mind
Reviewed in Canada on November 27, 2021
Style: Smart Water ShutoffSize: 3/4 inchVerified Purchase
One person found this helpful
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Robert McKay
5.0 out of 5 stars Excellent Product with many nice features. Support excellent
Reviewed in Canada on February 14, 2021
Style: Smart Water ShutoffSize: 1 InchVerified Purchase