Water Leak Sensors · Head to head

Ring Flood & Freeze Sensor (2nd Gen) vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Ring and Shelly sites.
2026 verdict
A leak sensor that shouts in the room versus one that only pings your phone is the choice here, and the Shelly Flood Gen4 is the better-rounded device.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99

Last recorded price

Buy on Amazon USA
It carries a three-year warranty against one, lists Wi-Fi, Bluetooth, Zigbee and Matter, and adds a buzzer and an LED on the unit plus temperature and freeze alerts. The Ring Flood & Freeze Sensor (2nd Gen) answers with a tougher IP66 housing and a battery rated for about six years against about two, and it reports over Amazon Sidewalk even when home Wi-Fi is down. Take the Shelly for a mixed smart home and a local alarm; take the Ring for a damp basement or crawlspace where the longest battery and the strongest seal matter most.
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FeatureRing Flood & Freeze Sensor (2nd Gen)Shelly Flood Gen4Winner
Rating3.74.2Shelly Flood Gen4
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceIP66IP44Ring Flood & Freeze Sensor (2nd Gen)
Battery Life6 years2 yearsRing Flood & Freeze Sensor (2nd Gen)
ConnectivityOther2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsHome AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
AlertsWater Leak Alerts, Freeze Temperature AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsShelly Flood Gen4
On Device Alert SoundNOYESShelly Flood Gen4
On Device Alert LightNOYESShelly Flood Gen4
Price$39.99$39.99Tie
SensorsWater Leak, TemperatureWater Leak, TemperatureTie

What the differences mean

Protocols

The Shelly Flood Gen4 lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter, so it can join whichever hub you settle on. The Ring Flood & Freeze Sensor (2nd Gen) connects over Amazon Sidewalk only, with no Wi-Fi or Zigbee of its own, which makes it a Ring-only device.

Local warning

The Shelly Flood Gen4 has a built-in buzzer and an LED so it alerts in the room without an app, while the Ring Flood & Freeze Sensor (2nd Gen) has neither an on-device sound nor a light. If you want to hear the alarm where the leak is, only one of these does it.

Sealing and placement

The Ring Flood & Freeze Sensor (2nd Gen) is IP66, enough for a damp crawlspace or a basement floor, against the IP44 of the Shelly Flood Gen4. That gap decides where each can safely sit in a wet utility area.

Battery

The Ring Flood & Freeze Sensor (2nd Gen) is rated for about six years on two AA cells, while the Shelly Flood Gen4 runs about two years on four AA cells. Both are set-and-forget, but the Ring stretches far longer between changes.

Warranty

The Shelly Flood Gen4 carries a three-year warranty and the Ring Flood & Freeze Sensor (2nd Gen) one year. For a device left unattended under a floor, the longer cover favors the Shelly.

Integrations

The Shelly Flood Gen4 reaches Google Home, Apple Home and SmartThings through Matter, plus Home Assistant. The Ring Flood & Freeze Sensor (2nd Gen) lives in the Ring app and reaches Home Assistant, with no Google Home, Apple Home, SmartThings or Matter.

Which one to buy if

Winner
Shelly

Shelly Flood Gen4

Prime exclusive deal
$39.99

Last recorded price

Buy on Amazon USA
  • + Rating: 4.2
  • + Warranty: 3 years
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
  • - Weather Resistance: IP44 vs IP66
  • - Battery Life: 2 years vs 6 years

What owners say

Owners of both sensors agree the job is simple and the setup is quick, and each group credits the device with catching a leak before it spread. Shelly Flood Gen4 owners, many of them on Home Assistant and Zigbee2MQTT, single out the 2-meter probe cable that senses the first drop and the buzzer and LED that report without a phone, while warning that Wi-Fi and Matter pairing is fussier than the native Zigbee path. Ring Flood & Freeze Sensor (2nd Gen) owners praise the Amazon Sidewalk link, which kept reporting during a Wi-Fi outage, and the multi-year battery, but note there is no local sound or light and no valve shutoff.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Ring Flood & Freeze Sensor (2nd Gen)
  • Shelly Flood Gen4

Loading price history...

Frequently Asked Questions

Which is better overall: Ring Flood & Freeze Sensor (2nd Gen) or Shelly Flood Gen4?

The Shelly Flood Gen4 suits more homes, with Wi-Fi, Zigbee, Bluetooth and Matter, a local buzzer and LED, temperature and freeze alerts and a three-year warranty. The Ring Flood & Freeze Sensor (2nd Gen) wins where the seal and battery matter more, with IP66 and a battery rated for about six years.

What is the biggest difference between the Ring Flood & Freeze Sensor (2nd Gen) and the Shelly Flood Gen4?

Connection and alerting. The Shelly Flood Gen4 lists Wi-Fi, Bluetooth, Zigbee and Matter plus an on-device buzzer and light, while the Ring Flood & Freeze Sensor (2nd Gen) uses Amazon Sidewalk only and sends notifications without any local sound or light.

Does the Ring Flood & Freeze Sensor (2nd Gen) work with Google Home or Apple Home?

No. The Ring Flood & Freeze Sensor (2nd Gen) lives in the Ring app and reaches Home Assistant, but not Google Home, Apple Home, SmartThings or Matter. The Shelly Flood Gen4 reaches those platforms through Matter.

Which of the two works when the home Wi-Fi goes down?

The Ring Flood & Freeze Sensor (2nd Gen), which reports over Amazon Sidewalk rather than home Wi-Fi. The Shelly Flood Gen4 depends on your network or hub to stay connected.

Can either sensor turn off the water automatically?

No. The Shelly Flood Gen4 and the Ring Flood & Freeze Sensor (2nd Gen) both detect and alert only. The Ring sensor has no valve control, and the Shelly sensor triggers alarms and automations rather than closing a valve itself.

Who should buy the Shelly Flood Gen4, and who should buy the Ring Flood & Freeze Sensor (2nd Gen)?

Buy the Shelly Flood Gen4 for a mixed smart home that wants a local alarm and a probe cable. Buy the Ring Flood & Freeze Sensor (2nd Gen) for a Ring household, a damp crawlspace, or anywhere the longest battery and an IP66 seal come first.

Full comparison table

Compare all 34 Water Leak Sensors side by side

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