Water Leak Sensors · Head to head

Kidde WiFi Water Leak & Freeze Detector vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Kidde and Shelly sites.
2026 verdict
Matter, Zigbee and a three-year warranty put the Shelly Flood Gen4 clearly ahead of the Kidde WiFi Water Leak & Freeze Detector.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
Shelly wins on owner reviews, that 3-year warranty, IP44 sealing, Wi-Fi plus Bluetooth plus Zigbee, a full integration set including Matter and Apple HomeKit, and an on-device alert light, with a 2-meter sensor cable for spots a puck cannot sit. The Kidde WiFi Water Leak & Freeze Detector stays cheaper and still lists a fuller alert set on the freeze side of the sheet. Choose the Shelly Flood Gen4 for a multi-protocol leak-and-freeze sensor in Home Assistant or Matter homes; pick the Kidde WiFi Water Leak & Freeze Detector only if you want the lowest-cost hub-free Wi-Fi puck and can live without Matter, HomeKit and a probe.
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FeatureKidde WiFi Water Leak & Freeze DetectorShelly Flood Gen4Winner
Price$17.14$39.99Kidde WiFi Water Leak & Freeze Detector
Rating3.94.2Shelly Flood Gen4
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceNOIP44Shelly Flood Gen4
Connectivity2.4 GHz WiFi2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsGoogle Home, Alexa, Home AssistantGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature AlertsKidde WiFi Water Leak & Freeze Detector
On Device Alert LightNOYESShelly Flood Gen4
SensorsWater Leak, TemperatureWater Leak, TemperatureTie
On Device Alert SoundYESYESTie
Winner
Shelly

Shelly Flood Gen4

$39.99
Buy on Amazon USACheck price
  • + Rating: 4.2
  • + Warranty: 3 years
  • + Weather Resistance: IP44
  • - Price: $39.99 vs $17.14
  • - Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts vs Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts

Frequently Asked Questions

Which is better overall: the Kidde WiFi Water Leak & Freeze Detector or the Shelly Flood Gen4?

The Shelly Flood Gen4 wins overall on reviews, warranty, weather resistance, connectivity, integrations, and an alert light, with Matter, Zigbee and an included sensor cable. The Kidde WiFi Water Leak & Freeze Detector is the cheaper hub-free alternative.

What is the biggest difference between the Kidde WiFi Water Leak & Freeze Detector and the Shelly Flood Gen4?

Protocol flexibility. The Shelly Flood Gen4 speaks Wi-Fi, Bluetooth, Zigbee and Matter, works with Alexa, Google Home, HomeKit, SmartThings and Home Assistant, is IP44, carries a 3-year warranty, and includes a 2 m sensor cable. The Kidde WiFi Water Leak & Freeze Detector is 2.4 GHz Wi-Fi only, with Alexa, Google Home and Home Assistant, and no Matter or HomeKit.

Do both sensors warn about freezing pipes?

Yes. Both the Shelly Flood Gen4 and the Kidde WiFi Water Leak & Freeze Detector include temperature sensing plus freeze-temperature alerts alongside leak alerts.

Does the Shelly Flood Gen4 need a hub?

Not for Wi-Fi. It can join 2.4 GHz Wi-Fi on its own, or run Zigbee through a Zigbee coordinator, and it supports Matter. The Kidde WiFi Water Leak & Freeze Detector is Wi-Fi only and also needs no hub.

Who should buy the Shelly Flood Gen4?

Home Assistant, Zigbee or Matter buyers who want a 3-year warranty, an included probe cable, local automations, and the widest protocol set in this pair.

Who should buy the Kidde WiFi Water Leak & Freeze Detector?

Buyers who want the cheaper hub-free Wi-Fi leak-and-freeze puck with Alexa or Google Home, and who do not need Matter, HomeKit, Zigbee or a sensor cable.

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