$54.72
Updated October 2026
Data from Amazon and official Moen and Shelly sites.
2026 verdict
The Shelly Flood Gen4 wins this matchup with broader connectivity and a longer warranty: it speaks Wi-Fi, Zigbee, Bluetooth and Matter, includes a 2 m sensing cable and is backed for three years.
The Moen Smart Leak Detector is the tougher sensor in damp spots with its IP67 rating and adds temperature and humidity trends and a 48-inch remote disc, but it relies on a single 2.4 GHz Wi-Fi radio and a quieter 51 dB alarm. Choose the Shelly for a multi-protocol setup and the Moen when you want a hub-free sensor rated for wet places.
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| Feature | Moen Smart Leak Detector | Shelly Flood Gen4 | Winner |
|---|---|---|---|
| Price | $54.72 | $39.99 | Shelly Flood Gen4 |
| Rating | 3.3 | 4.1 | Shelly Flood Gen4 |
| Warranty | 1 year | 3 years | Shelly Flood Gen4 |
| Weather Resistance | IP67 | IP44 | Moen Smart Leak Detector |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi, Bluetooth, Zigbee | Shelly Flood Gen4 |
| Integrations | Home Assistant | Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Shelly Flood Gen4 |
| Battery Life | 2 years | 2 years | Tie |
| Sensors | Water Leak, Temperature | Water Leak, Temperature | Tie |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | Tie |
| On Device Alert Sound | YES | YES | Tie |
| On Device Alert Light | YES | YES | Tie |
What the differences mean
Protocols
The Shelly Flood Gen4 supports Wi-Fi, Zigbee, Bluetooth and Matter in one sensor. The Moen Smart Leak Detector is 2.4 GHz Wi-Fi only.
Sensing cable
The Shelly Flood Gen4 includes a 2 m extendable cable. The Moen Smart Leak Detector ships with a 48-inch remote sensing disc, shorter but still useful in a sump pit.
Weather rating
The Moen Smart Leak Detector is IP67 rated for damp, wet spots. The Shelly Flood Gen4 is IP44, which handles splashes but not immersion.
Warranty
The Shelly Flood Gen4 carries a three-year warranty, against one year for the Moen Smart Leak Detector.
Power
The Shelly Flood Gen4 runs on four AA batteries rated for about two years. The Moen Smart Leak Detector uses a single CR123A rated for about two years.
Temperature and humidity
The Moen Smart Leak Detector reports temperature and humidity trends with freeze alerts. The Shelly Flood Gen4 senses temperature and sends temperature and freeze alerts but does not report humidity.
Which one to buy if
- your home runs on Matter or Zigbee
The Shelly Flood Gen4 joins Matter and Zigbee as well as Wi-Fi; the Moen Smart Leak Detector is Wi-Fi only.
- the sensor may sit in a wet basement or crawlspace
The Moen Smart Leak Detector is IP67 rated; the Shelly Flood Gen4 is only IP44.
- you want the longest warranty
The Shelly Flood Gen4 is backed for three years against one for the Moen Smart Leak Detector.
- you want temperature and humidity readouts
The Moen Smart Leak Detector reports both temperature and humidity trends, which the Shelly Flood Gen4 does not.
- you want a remote probe for a tight spot
The Moen Smart Leak Detector's 48-inch disc reaches where the body fits but the leak does not.
$54.72
- + Weather Resistance: IP67
- - Price: $54.72 vs $39.99
- - Rating: 3.3 vs 4.1
Winner
$39.99
- + Price: $39.99
- + Rating: 4.1
- + Warranty: 3 years
- - Weather Resistance: IP44 vs IP67
What owners say
Owners of both sensors agree a leak is caught quickly once the device is online. Shelly Flood Gen4 owners who pair it over Zigbee with Home Assistant describe fast, stable connections and a cable sensitive enough to catch a single drop, and they like the local buzzer and LED; their friction is Wi-Fi onboarding, which several found slow or finicky, and Matter or HomeKit status that sometimes needs a manual button press to refresh. Moen Smart Leak Detector owners value the remote sensing disc for sump pits and the temperature and humidity readout, but many describe a difficult, looping app setup and a battery that arrived partly drained. Both groups treat careful placement near the likely leak point as essential.
Frequently Asked Questions
Which is better overall: Moen Smart Leak Detector or Shelly Flood Gen4?
For a multi-protocol home, the Shelly Flood Gen4, with Wi-Fi, Zigbee, Bluetooth and Matter plus a longer warranty and a 2 m cable. The Moen Smart Leak Detector is the better pick when the sensor has to sit in a damp place, thanks to its IP67 rating and its temperature and humidity readout.
What is the biggest difference between the Moen Smart Leak Detector and the Shelly Flood Gen4?
Connectivity. The Shelly Flood Gen4 supports Wi-Fi, Zigbee, Bluetooth and Matter, while the Moen Smart Leak Detector is limited to 2.4 GHz Wi-Fi, which also settles how each one reaches a hub and its automations.
Are the Moen Smart Leak Detector and the Shelly Flood Gen4 waterproof?
The Moen Smart Leak Detector is IP67 rated, so it tolerates splashes and shallow water. The Shelly Flood Gen4 is IP44, fine for splashes but not for immersion.
Do these sensors measure temperature and humidity?
The Moen Smart Leak Detector reports both temperature and humidity trends and sends freeze alerts. The Shelly Flood Gen4 senses temperature and offers temperature and freeze alerts but does not report humidity.
Who should buy the Moen Smart Leak Detector?
Buyers who want a hub-free Wi-Fi sensor rated IP67 for a basement or crawlspace, with temperature, humidity and freeze alerts and a remote sensing disc.
Who should buy the Shelly Flood Gen4?
Home Assistant, Zigbee2MQTT and Matter users who want protocol flexibility, a 2 m sensing cable, local automations and a three-year warranty.
Full comparison table
Compare all 34 Water Leak Sensors side by side
You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 34 Water Leak Sensors
- 36 specs compared
- 33 filters
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Third RealityWater Leak Sensor
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ButtonsShellyBLU Button Tough 1 ZB
4.7(12)Unavailable
ButtonsShellyBLU RC Button 4 ZB
4.0(25)$23.99
CamerasShellyCamera
DisplaysShellyWall Display X1i
€188.37
DisplaysShellyWall Display XL
4.1(65)$349.99
DisplaysShellyWall Display
4.4(435)€128.98
Door & Window SensorsShellyBLU Door/Window Outdoor ZB
Door & Window SensorsShellyBLU Door/Window ZB
4.6(42)$22.99
Energy MonitorsShelly3EM-63W Gen3
4.5(152)$114.99
Energy MonitorsShellyEM Gen3
4.6(269)$69.99
Energy MonitorsShellyEM Gen4
Unavailable
Energy MonitorsShellyEM Mini Gen4
4.5(139)$24.99
Energy MonitorsShellyPro 3EM 3CT63
4.4(351)$150.99
Energy MonitorsShellyPro 3EM-400
4.3(21)$329.99
Energy MonitorsShellyPro 3EM v2
4.5(84)$154.99
Energy MonitorsShellyPro EM-50
4.6(956)$119.99
Gas DetectorsShellyGAS (CNG)
4.2(45)€64.21
Gas DetectorsShellyGAS (LPG)
LED BulbsShellyMulticolor Bulb E27 Gen3
4.2(35)€9.90
Motion SensorsShellyBLU Motion ZB
4.4(50)$26.99