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  • Flo by Moen Smart Water Leak Detector

  • Wasserstein Wi-Fi Water Leak Sensor

  • How We Tested Smart Water Leak Detectors

  • What You Should Know About Smart Water Leak Detectors

  • Privacy

  • Other Smart Water Leak Detectors We Tested

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Our Favorite Smart Water Leak Detectors of 2021

  1. Best Overall

    Moen Flo

    Pros

    • Easy-to-use app

    • Instant alerts

    • Compact design

    Cons

    • Companion app lacks two-factor authentication

    • No smart assistant integration

    Skip to the full review below
  2. Best Value

    Wasserstein Wi-Fi Water Leak Sensor

    Pros

    • Reliable

    • Quick and simple setup

    • Quick to send alerts

    Cons

    • Feels a little flimsy

    • Companion app lacks two-factor authentication

    • No smart assistant integration

    Skip to the full review below
Flo by Moen Smart Water Leak Detector
Credit: Reviewed / Rachel Murphy

The Flo by Moen Smart Water Leak Detector is a reliable gadget to help protect your home from water damage.

Best Overall
Flo by Moen Smart Water Leak Detector

Flo by Moen’s Smart Water Leak Detector is the very best that you can buy. It sends alerts near-instantaneous alerts (an imperative function of a smart leak detector) to both of our iOS and Android devices, as well as via email.

The Moen's connected water leak detector passed all of our tests with flying colors and even continued to function after being submerged in water during our final round of testing. When a leak is detected, the sensor begins playing an alarm sound and flashes red, in addition to sending timely alerts in a matter of seconds.

The leak detector isn't compatible with any smart assistants like Amazon Alexa, Google Assistant, or Apple's Siri. However, what it lacks in voice-control capabilities, it makes up for with a beautifully designed app full of useful data insights. The sensor also keeps track of the temperature and humidity within your home, which can help with moisture control.

The compact design of the Flo by Moen detector is easy to place in small areas like bathrooms, basements, and under sinks, where leaks are common. An adhesive wall bracket is included for mounting the Moen leak detector, as well as a 4-foot probe, which easily slides under washing machines and other hard-to-reach spaces where moisture can occur.

Although we haven’t tested it, the smart water leak detector can be paired with the Flo by Moen Smart Water Shutoff, so if a leak is detected, you can automatically shut off the water to your home in the Flo by Moen app. This is a really cool feature that could help you avoid costly water damage if an emergency strikes when you’re away from home.

Overall, the Flo by Moen Smart Water Leak Detector is the most intelligent leak detector we’ve tested thanks to real-time alerts when a leak occurs. The simple setup, quick installation, and ease of use add to the package, making this leak sensor a wise investment for any homeowner.

Pros

  • Easy-to-use app

  • Instant alerts

  • Compact design

Cons

  • Companion app lacks two-factor authentication

  • No smart assistant integration

Wasserstein WiFi Water Leak Sensor
Credit: Wasserstein

The Wasserstein Wi-Fi Water Leak Sensor is easy to use and install, sends notifications quickly, and has a battery life of six months or longer before it will need to be replaced.

Best Value
Wasserstein Wi-Fi Water Leak Sensor

Wasserstein’s Wi-Fi Leak Sensor earns our Best Value pick for several reasons. Although it wasn’t the quickest at sending alerts, it still managed to send notifications in under 20 seconds over both Wi-Fi and cellular data, which is right on the money.

The setup process is about as easy as it gets. There’s a scannable QR code in the instruction manual that takes you to the Wasserstein App, and it takes less than a minute to follow the prompts and get the leak detector up and running.

Wasserstein’s leak detector comes with a probe, which is a helpful addition if you want to slide the sensor into a tight space like underneath or behind a washing machine or dishwasher. It also comes with a wall anchor, so you can hang the larger portion of the leak detector nearby and place the probe where possible leaks might arise.

And, at under $30, it packs quite a bang for your buck.

Pros

  • Reliable

  • Quick and simple setup

  • Quick to send alerts

Cons

  • Feels a little flimsy

  • Companion app lacks two-factor authentication

  • No smart assistant integration

Related content

How We Tested Smart Water Leak Detectors

The Testers

Hi, I’m Rachel Murphy, Reviewed’s smart home staff writer. I live in a smart home that’s full of smart cameras, smart plugs, smart speakers, and more. During my tenure at Reviewed, I’ve tested smart mini projectors, smart doorbells, and other gadgets that can be controlled remotely or via smart assistants such as Amazon’s Alexa and Google Assistant. I spent about a month testing these 10 smart water leak detectors and retesting four of the leak sensors we previously tested.

Our original smart leak detector testing was conducted by Daniel Wroclawski, a tech-obsessed editor who co-led the news and features team for Reviewed back in 2016. Nowadays, he writes about the latest smart home products for Consumer Reports.

The Tests

These detectors can detect leaks, changes in water temperature, humidity, and much more. We tailored our testing to determine how these products operated both as smart home devices and as water leak sensors. This led us to ask two different types of questions:

Is it a good smart home device?—How easy is it to set up the "smart" part of these smart water leak sensors? Does it require an app or a smart home hub? How easily does it integrate into an existing smart home environment? Can the device be controlled remotely when you're not home? Does the device have trouble maintaining connectivity?

Is it a good water leak sensor?—Does the sensor actually detect water? Does it reliably sound an alarm or send out notifications? Could the sensor survive being completely submerged? Did it float?

Our favorite smart water leak sensors were both painless to set up and use, and consistently sensed and alerted us to the presence of water. The very best sensors were able to persist despite being completely submerged in water, or they floated.

What You Should Know About Smart Water Leak Detectors

What is a Smart Water Leak Detector?

A smart water leak detector is a small gadget with built-in sensors that can signal a leak as soon as it happens. The sensor works by hanging out near a water supply and sending a notification to your phone via the companion app when water is detected, as long as you’ve created an account and downloaded the app ahead of time.

For the most part, the leak-detecting sensors are located on the bottom of the gadget, which itself is small enough to hold in your hand. Some models come with a cable sensor attached to a cord that helps extend the reach of the detector. When the sensor sends out an alert, it should, in theory, give you enough time to get to your home's water line shut off valves or make a quick emergency repair.

The Benefits of a Smart Water Leak Detector

Water leaks can be problematic for homeowners—and in most circumstances, it’s a situation that requires immediate attention from a professional. But, a smart leak detector can sometimes catch leaks before they become a giant headache, helping you avoid costly damage.

The biggest advantage is that these leak detectors can alert you to a problem by sending notifications to your smartphone or, with some leak sensors, your email account. This is especially helpful if the leak happens while you’re away from home so that you can address the issue in a timely manner instead of coming home to a flooded house. Most of the leak detectors we tested also come with an audible alarm.

Pipes can burst for a number of reasons. Too much water pressure or corrosion can cause pipes to explode, or pipes may crack and spurt out water due to cold weather. And when water seeps into your home, it can cause mold spores to grow and spread, and cause damage to drywall, flooring, and more. A smart leak detector can help you catch leaks (and frozen pipes) with a push notification and/or loud alarm before they become a major problem.

Where to Place a Smart Water Leak Detector

Since the main purpose of a smart water leak detector is to find leaks before they turn into a major problem, you should place the sensors in and around the pipes in your home like behind toilets and underneath sinks, and by large appliances like water heaters, dishwashers, and washing machines.

Placing leak sensors throughout areas of the home that are prone to leaks or have experienced water damage in the past is also a good idea. This might mean making a trip or two up into the attic, but luckily most smart water leak detectors are small enough to fit in the palm of your hand and are very lightweight.

They're also pretty simple to set up, and you shouldn't need to pay for a professional installation.

Insurance companies sometimes offer discounts to homeowners who have water leak detectors, since they can help safeguard your home against major water damage. However, this varies by company. Be sure to check with your insurance provider about any available price reductions, as well as what models qualify for possible discounts.

What to Do if Your Wi-Fi Connection Isn’t Great

Depending on how far your leak sensor is from your Wi-Fi set up, it may have trouble communicating with your internet connection, which can hinder your ability to receive leak alerts.

If that's the case, we recommend using a mesh Wi-Fi router to bolster the connection. The Google Wi-Fi three-pack ships with one router that connects to broadband, and two nodes to extend the Wi-Fi signal. It's simple to set up, guides you through the best placement of the nodes for optimal performance and coverage, and works great in apartment buildings and standalone homes.

Privacy

There’s always a potential privacy risk involved when you use internet-connected devices at home. To help safeguard your smart home, there are some steps you can take. First, look for devices that offer two-factor authentication, which sends a code to your mobile device to verify it’s really you. That way, if someone tries to hack into your account, you will receive an alert and can quickly take care of the problem. Many devices also allow you to activate email or other push notifications in the settings to alert you if someone has logged on.

Additionally, make sure to use a unique, strong password composed of multiple characters, numbers, and letters for each of your smart home accounts. Data breaches feel like the norm as of late, making it all the more important to use different passwords across multiple websites and apps.

When using any devices with smart assistants like Alexa, Google Assistant, and Siri, you can further protect your privacy by regularly deleting your voice recordings and muting the speaker’s mic when it’s not in use.

Looking for more privacy tips? Read our guide to securing your smart home.


Other Smart Water Leak Detectors We Tested

Product image of Ring Alarm Flood & Freeze Sensor
Ring Alarm Flood and Flood Sensor

If you have a Ring alarm system, the Ring Flood Sensor is the perfect leak detecting device to integrate with your home security setup. The alarm system is a requirement for using the water sensor, which is why we only recommend it for homes with existing Ring systems.

The small, circular device is flat enough to fit under sinks, refrigerators, toilets, and other areas where leaks may occur. It doesn't come with an extension probe as some other leak detectors do, so make sure Ring's design fits your intended usage space before you buy.

Once in place, it works like a charm, sending timely smart alerts to your phone or tablet as soon as it comes into contact with water. It can also send you notifications when the temperature drops, alerting you to any potential frozen pipes. Currently, there are no Alexa integrations that work with Ring’s flood sensor—only push notifications. The sensor is managed via the Ring app, which offers mandatory two-factor authentication.

The sensor runs on a replaceable lithium battery, which has a lifespan of up to three years. Using the Ring Alarm System’s Home Base station, the Flood connects over Z-Wave and must be within 250-feet of the hub to function properly. Additional range extenders are available for purchase.

Pros

  • Great for Ring Alarm systems

  • Mandatory two-factor authentication

  • Reliable

Cons

  • Requires Ring Alarm for operation

  • No Alexa integrations

Product image of Eve Water Guard
Eve Water Guard

Looking for a water leak detector that works with Apple HomeKit? The Eve Water Guard is more expensive than some other leak detectors, but it's one of the few options that plays nicely with Apple HomeKit. This means it does not support Android operating systems, so it's not a great pick for everyone. For Siri users, however, the Eve leak detector is a smart choice in more ways than one.

The device runs through the Apple Home app and connects via Bluetooth. For remote management, an Apple Home Hub like the HomePod Mini is required.

The Guard comes with a 6.5-foot sensing cable that is small enough to fit in tight spaces like under the dishwasher or washing machine. When water is detected, the sensor plays a blistering 100-decibel siren, flashes a red light, and quickly sends smart alerts to your iPhone, iPad, and/or Apple Watch. Suffice to say, if water is detected, you’re going to know about it in a timely manner, which is the most important feature of a smart water leak detector.

Pros

  • Ideal for Apple HomeKit

  • Reliable

  • Includes extension probe

Cons

  • No Android support

  • iOS only

Product image of Govee Water Leak Detector / Wi-Fi Smart Gateway
Govee Wi-Fi Water Leak Detector

Compared to some of the other water leak detectors we tested, the Govee Wi-Fi Water Leak Detector was pretty easy to set up. It didn’t take to my Wi-Fi on the first attempt, but on the second try, the device was set up in under 60 seconds.

Despite a mostly smooth setup, the notifications were a bit finicky. The leak detector sends near-instant alerts over Wi-Fi, but the notifications never came when my phone was connected to data. Overall, Govee’s water leak sensor works great if you have a steady internet connection. But, if you’re solely relying on your phone’s data to receive alerts, you may not get them.

The Govee Home app is easy to navigate, but it doesn’t offer as many factoids about the sensor (such as temperature, humidity, and battery life) like the other water sensors. The app does, however, keep a history of when leaks were detected. One of the best features of the app is the ability to go in once a leak has been detected and turn the audible alarm off. Most water leak detectors we tested don’t offer this feature, but it’s totally necessary to shut off this sensor’s ear-splitting alarm tone.

Of all the sensors we tested, this one by far is the least pleasing to listen to. It sounds more like a squealing car alarm, and that seems a bit excessive for a water leak detector unless it’s placed in such a distant corner of your home that you’re afraid you won’t hear it.

Pros

  • Simple set up

  • App is easy to navigate

  • Ability to turn alarm off from app

Cons

  • Alerts over data don't always work

  • App doesn't offer helpful insights

  • Alarm sound is excessive

Product image of Phyn Smart Water Sensor
Phyn Smart Water Sensor

The Wi-Fi-enabled Phyn Smart Water Sensor doesn't offer any integration with smart platforms like Apple HomeKit, Amazon Echo, or Google Home. Rather, it runs through the Phyn mobile app, which sends smart alerts when water is detected.

For the most part, the sensor does a good job of reporting any leaks, but there were several occasions when it took too long to get alerts. It also plays an audible alarm tone, but the overall sound is too soft to hear from another room with the door closed. The only way to cease the sound is by pressing the button on the top of the device, which may be hard to get to depending on where you place it.

The device is comparable in size to a hockey puck, rendering it too large to fit under appliances. Instead, you can buy a Phyn extension node to ensure full coverage in tight spaces.

Additionally, the sensor tracks temperature and humidity numbers and can send you alerts when the readings drop below your custom threshold. It runs off of two AA batteries, which should last you about two years before they will need to be replaced. The app only supports nine water leak sensors per account, which can add up quickly if you live in a large home.

Pros

  • Easy-to-use mobile app

  • Customizable alerts

Cons

  • No smart assistant integrations

  • Some delay in push notifications

  • Soft alarm tone

Product image of Fibaro FGBHFS-001 Flood Sensor
Fibaro Flood Sensor (HomeKit)

One of two leak detectors we tested that works with Apple HomeKit, the Fibaro Flood Sensor offers the unique ability to be checked during a chat with Siri. It is also the only other sensor we tested that is able to float and survive flooding, but those are the only real positives to the device.

It only works with Apple devices and runs over Bluetooth, meaning you'll need to use an iPad, HomePod Mini, or an Apple TV as an Apple Home Hub to receive leak alerts when you're away. As for the alerts, they would only come through the Apple Home app during our tests, not Fibaro's companion app. If you desperately want a HomeKit-compatible sensor, this is probably your best option, but it’s not a great one.

Pros

  • Works with Apple HomeKit

  • Sensor floats and holds up to flooding

Cons

  • Doesn't work with Alexa or Google Assistant

Product image of Zircon Leak Alert WiFi
Zircon Leak Alert Wi-Fi

The Zircon Leak Alert Wi-Fi Detector is large and bulky. Furthermore, the setup process took us longer than anticipated, as we could not get the sensor to connect to Wi-Fi after five attempts. When setting up the sensor, you need to enter the leak detector’s IP address into a browser like Chrome or Safari. For whatever reason, we were unable to get this to work on a laptop browser using Google Chrome but finally got it to work when using the Safari browser on an iPhone XR.

The Zircon sensor does not have a companion app. That means when a leak is detected, the device only sends email alerts to the account of your choice (you get to indicate this during setup). This part is a major bummer because push notifications from companion apps are one of the primary ways you can be alerted to a leak at home.

The sensor plays a very loud 105-decibel tone when water is detected. As for the timeliness of the notifications, over Wi-Fi, the Zircon detector immediately played a sound as soon as it came into contact with water. However, the email notification didn’t come through until almost four minutes later.

The detector runs on a 3V lithium battery that’s included with your purchase. When the battery life starts to run low, the device will beep every five seconds. It doesn’t integrate with popular smart home ecosystems like Amazon’s Alexa or Google Assistant. And, once it comes into contact with liquid, it’s almost impossible to dry off (which is what you have to do to stop the blaring alarm). A final note: The leak alert detector is splash- and water-resistant, but it is not meant to be submerged.

Pros

  • Detects leaks in a timely fashion

Cons

  • Larger than other sensors we tested

  • Only sends email alerts

  • No companion app

Meet the tester

Rachel Murphy

Rachel Murphy

Senior Staff Writer

@rachel_murphy

Rachel Murphy covers smart home for Reviewed. She holds a journalism degree from the University of Central Florida. Previously, she worked as a freelance writer for several major outlets and as an associate editorial producer for ABC News' Good Morning America.

See all of Rachel Murphy's reviews

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