$54.72
Updated November 2026
Data from the official Moen and Shelly sites.
2026 verdict
The Shelly Flood is the better budget water leak sensor here: it joins 2.4 GHz Wi-Fi with no hub, doubles as a temperature sensor and carries a two-year warranty.
The Moen Smart Leak Detector offers more on the device itself, with a 48-inch remote sensing disc, a 51 dB buzzer and an alert light, plus temperature and humidity trends, but it costs more and its app setup is widely described as difficult. Take the Shelly for cheap multi-sensor coverage and the Moen when you want a remote probe and local alerts in one kit.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
3% OFF
€25.40
€26.09
Works with
Connectivity
- Wi-Fi 2.4 GHz
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The biggest differences
Where these two are furthest apart, and by how much.
- Warranty2×Shelly Flood2 years vs 1 year
- Battery Life+33%Moen Smart Leak Detector2 years vs 1.5 years
| Feature | Moen Smart Leak Detector | Shelly Flood | Winner |
|---|---|---|---|
| Price | $54.72 | €25.40 | Shelly Flood |
| Rating | 3.3 | 3.8 | Shelly Flood |
| Warranty | 1 year | 2 years | Shelly Flood |
| Battery Life | 2 years | 1.5 years | Moen Smart Leak Detector |
| Integrations | Home Assistant | Google Home, Samsung SmartThings, Home Assistant | Shelly Flood |
| On Device Alert Sound | YES | NO | Moen Smart Leak Detector |
| On Device Alert Light | YES | NO | Moen Smart Leak Detector |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | 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 |
What the differences mean
Setup
The Shelly Flood configures from a phone browser with no app required. The Moen Smart Leak Detector depends on the Moen app, which many owners describe as difficult to pair.
Remote probe
The Moen Smart Leak Detector includes a 48-inch remote sensing disc for sump pits. The Shelly Flood has no cable and sits where the water is.
Local alert
The Moen Smart Leak Detector has a 51 dB buzzer and an alert light. The Shelly Flood has neither.
Battery
The Moen Smart Leak Detector uses a CR123A rated for about two years and included. The Shelly Flood's CR123A is rated for about 1.5 years and not included.
Platforms
The Shelly Flood supports Google Home, Samsung SmartThings and Home Assistant. The Moen Smart Leak Detector lists only partial Home Assistant support, with no HomeKit, SmartThings, Google Home or Matter.
Which one to buy if
- you want to cover many spots cheaply
The Shelly Flood is inexpensive and needs no hub, so several units stay affordable.
- you want a remote probe for a sump pit
The Moen Smart Leak Detector includes a 48-inch remote sensing disc.
- you want a local buzzer and light
The Moen Smart Leak Detector has both; the Shelly Flood alerts only through the app and Wi-Fi.
- you run Google Home or SmartThings
The Shelly Flood supports both; the Moen Smart Leak Detector supports neither.
- you want the longest battery life
The Moen Smart Leak Detector is rated for about two years against about 1.5 for the Shelly Flood.
$54.72
- + Battery Life: 2 years
- + On Device Alert Sound: YES
- + On Device Alert Light: YES
- - Price: $54.72 vs €25.40
- - Rating: 3.3 vs 3.8
Winner
3% OFF
€25.40
€26.09
- + Price: €25.40
- + Rating: 3.8
- + Warranty: 2 years
- - Battery Life: 1.5 years vs 2 years
- - On Device Alert Sound: NO vs YES
What owners say
Owners of both sensors like that a leak is reported quickly and that setup does not demand a hub. Shelly Flood owners praise the no-app browser setup, automatic pickup by Home Assistant once it is on Wi-Fi, and the temperature readings alongside flood detection; the recurring complaints are sensors that drop off Wi-Fi and need reconnecting, a pairing process that can take several attempts, and a CR123A that is not in the box. Moen Smart Leak Detector owners value the remote sensing disc and the temperature and humidity display, but many report a looping app setup and a battery that arrived partly drained, and some find the 51 dB alarm too quiet. Both groups say the battery is the thing to watch.
Frequently Asked Questions
Which is better overall: Moen Smart Leak Detector or Shelly Flood?
For most homes the Shelly Flood, because it is inexpensive, needs no hub and adds temperature sensing with a two-year warranty. The Moen Smart Leak Detector wins when you want a local buzzer and light and a 48-inch remote disc, at a higher price and with a rougher app setup.
Does the Shelly Flood need a hub or an app?
Neither. The Shelly Flood joins 2.4 GHz Wi-Fi on its own and configures from a phone browser. The Moen Smart Leak Detector also needs no hub but depends on the Moen app, which many owners describe as difficult.
Which sensor has a local alarm?
The Moen Smart Leak Detector has a 51 dB buzzer and an alert light. The Shelly Flood has no on-device sound or light, so notifications arrive through the app or your hub.
Do these sensors measure temperature?
Both do. The Shelly Flood reports temperature with water detection, and the Moen Smart Leak Detector adds humidity and freeze alerts alongside temperature.
Who should buy the Shelly Flood?
Home Assistant and Google Home users who want an inexpensive Wi-Fi sensor they can deploy several of, with no hub and a browser-based setup.
Who should buy the Moen Smart Leak Detector?
Buyers who need a remote sensing disc for a sump pit or a tight space, a local buzzer and light, and humidity plus freeze monitoring.
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