9% OFF
$99.95
$109.95
Also sold in packs
- Pack of 29% OFF$199.90$219.90$99.95 per unitBuy
Updated November 2026
Data from the official Eve and Shelly sites.
2026 verdict
Mains power and Thread against batteries and four radios: the Shelly Flood Gen4 is the more versatile water leak sensor, working with almost every platform and adding freeze alerts.
It connects over Wi-Fi, Zigbee, Bluetooth and Matter, works with Google Home, Apple Home, SmartThings and Home Assistant, measures temperature, carries a 3-year warranty and is the lower priced of the two. The Eve Water Guard is the better reviewed and the Apple Home specialist: native HomeKit over Thread and Bluetooth, no batteries since it plugs into the wall, and a 2 m sensing cable Eve says extends up to 150 m to watch a whole kitchen or laundry run. Both sound an alarm and flash a light on the device, and both ship with a sensing cable. Pick the Shelly Flood Gen4 for a mixed smart home or a spot with no outlet, and the Eve Water Guard for an Apple Home setup that needs long cable coverage.
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| Feature | Eve Water Guard | Shelly Flood Gen4 | Winner |
|---|---|---|---|
| Price | $99.95 | $39.99 | Shelly Flood Gen4 |
| Rating | 4.6 | 4.1 | Eve Water Guard |
| Warranty | 1 year | 3 years | Shelly Flood Gen4 |
| Connectivity | Bluetooth, Thread Protocol | 2.4 GHz WiFi, Bluetooth, Zigbee | Shelly Flood Gen4 |
| Integrations | Apple HomeKit, Home Assistant | Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Shelly Flood Gen4 |
| Sensors | Water Leak | Water Leak, Temperature | Shelly Flood Gen4 |
| Alerts | Water Leak Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | Shelly Flood Gen4 |
| Weather Resistance | YES | IP44 | Tie |
| On Device Alert Sound | YES | YES | Tie |
| On Device Alert Light | YES | YES | Tie |
| Local Control | YES | YES | Tie |
What the differences mean
Power
The Eve Water Guard plugs into the wall, so there are no batteries to replace but it must sit near an outlet. The Shelly Flood Gen4 runs on four AA cells rated for 2 years and can go anywhere.
Smart home platforms
The Shelly Flood Gen4 supports Matter today and works with Google Home, Apple Home, SmartThings and Home Assistant. The Eve Water Guard works with Apple Home and Home Assistant only, with Matter listed as coming.
Radios
The Eve Water Guard uses Thread, which needs a Thread border router, plus Bluetooth. The Shelly Flood Gen4 uses Wi-Fi, Zigbee or Bluetooth.
Cable coverage
Both include a 2 m sensing cable. Eve says the Eve Water Guard cable can be extended up to 150 m, enough to trace a whole wall of appliances; the Shelly Flood Gen4 cable is extendable too, with no maximum length in its specs.
Freeze alerts and warranty
The Shelly Flood Gen4 measures temperature, warns about freezing and carries a 3-year warranty. The Eve Water Guard detects water only and has a 1-year warranty.
Which one to buy if
- your home runs on Apple Home with a Thread border router
The Eve Water Guard is native HomeKit over Thread, and owners describe setup as scan-and-add with no account.
- you use Google Home or SmartThings
The Shelly Flood Gen4 works with both; the Eve Water Guard supports neither.
- there is no outlet near the leak point
The Shelly Flood Gen4 runs on batteries, while the Eve Water Guard needs wall power.
- one sensor has to watch a long run of appliances
The Eve Water Guard cable can be extended up to 150 m.
- pipes can freeze where the sensor sits
Only the Shelly Flood Gen4 sends temperature and freeze alerts.
9% OFF
$99.95
$109.95
- + Rating: 4.6
- - Price: $99.95 vs $39.99
- - Warranty: 1 year vs 3 years
Winner
$39.99
- + Price: $39.99
- + Warranty: 3 years
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
- - Rating: 4.1 vs 4.6
What owners say
Owners of both sensors praise the sensing cable, which lets one unit watch more than the spot under it, and both groups describe a local alarm plus app alerts that caught real leaks. Eve Water Guard owners single out scan-and-add Apple Home setup with no manufacturer account and automations built in the Home app, and credit it with catching a failed toilet flapper or a washing machine drip; their caveats are the price, the need for a wall outlet, a fabric cable that has to soak up a little water first and a few units that stopped working. Shelly Flood Gen4 owners talk about stable Zigbee pairing with Home Assistant and on-device automations that switch other Shelly devices, and complain about slow Wi-Fi onboarding and, over Matter into Apple Home, a status that sometimes did not refresh.
Frequently Asked Questions
Which is better overall: Eve Water Guard or Shelly Flood Gen4?
The Shelly Flood Gen4 for most homes. It works with every major platform through Matter, runs on batteries, adds freeze alerts and has a 3-year warranty. The Eve Water Guard is the better choice for Apple Home users who want mains power and very long cable coverage.
What is the biggest difference between the Eve Water Guard and the Shelly Flood Gen4?
Power and platform. The Eve Water Guard plugs into the wall and is built for Apple Home over Thread, while the Shelly Flood Gen4 runs on AA batteries and works with Google Home, Apple Home, SmartThings and Home Assistant.
Do the Eve Water Guard and the Shelly Flood Gen4 support Matter?
The Shelly Flood Gen4 does today. For the Eve Water Guard, Matter support is listed as coming but not yet available, so it works through native HomeKit and Home Assistant.
Do the Eve Water Guard and the Shelly Flood Gen4 have a sensing cable?
Both ship with a 2 m sensing cable. Eve says the Eve Water Guard cable can be extended up to 150 m; the Shelly Flood Gen4 cable is extendable too.
Who should buy the Eve Water Guard?
Apple Home households with a Thread border router who want one wall-powered sensor to watch a long run of appliances without ever changing batteries.
Who should buy the Shelly Flood Gen4?
Anyone on Google Home, SmartThings or Home Assistant, or placing a sensor far from an outlet, who wants leak and freeze alerts and a local alarm.
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