Water Leak Sensors · Head to head

Sonoff Zigbee Water Leak Sensor vs Third Reality Water Leak Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from the official Sonoff and Third Reality sites.
2026 verdict
Two Zigbee pucks, one real question: does the sensor itself need to scream?
Sonoff Zigbee Water Leak Sensor
Winner
Sonoff Zigbee Water Leak Sensor
$24.99
Buy on Amazon USA
For most Zigbee homes the Sonoff Zigbee Water Leak Sensor is the better pick, with wider platform support and a longer battery life. It works with Google Home, SmartThings and Home Assistant, reaches Apple Home and Matter through a SONOFF hub, is IP67 rated and is rated for 5 years on its CR2477 cell, and it is the lower priced and better reviewed of the two. The Third Reality Water Leak Sensor has the one feature the Sonoff lacks, a 120 dB alarm on the sensor that works even when the hub does not, and it runs on two common AAA cells. Both need a Zigbee hub and both detect water only. Choose the Sonoff Zigbee Water Leak Sensor for a quiet node inside your automations, and the Third Reality Water Leak Sensor if you want the leak heard across the house.
Works with
Connectivity
vs
Third Reality Water Leak Sensor
Third Reality
#10 Best Seller in Water Leak Sensors

Third Reality Water Leak Sensor

Prime exclusive deal
$20.99
Buy on Amazon USA

Also sold in packs

  • Pack of 2$39.99$20.00 per unitYou save $1.99Buy
  • Pack of 4$79.99$20.00 per unitYou save $3.97Buy
Works with
Connectivity
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FeatureSonoff Zigbee Water Leak SensorThird Reality Water Leak SensorWinner
Price$24.99$20.99Third Reality Water Leak Sensor
Rating4.54.1Sonoff Zigbee Water Leak Sensor
Battery Life5 years3 yearsSonoff Zigbee Water Leak Sensor
IntegrationsGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Apple HomeKit, Samsung SmartThings, Home AssistantSonoff Zigbee Water Leak Sensor
On Device Alert SoundNOYESThird Reality Water Leak Sensor
Warranty1 year1 yearTie
ConnectivityZigbeeZigbeeTie
SensorsWater LeakWater LeakTie
AlertsWater Leak Alerts, Low Battery AlertsWater Leak Alerts, Low Battery AlertsTie
On Device Alert LightNONOTie

What the differences mean

Alarm on the sensor

The Third Reality Water Leak Sensor has a 120 dB alarm built in, so a leak is heard even if the hub or internet is down. The Sonoff Zigbee Water Leak Sensor is silent and alerts only through your hub.

Platforms without an extra bridge

The Sonoff Zigbee Water Leak Sensor lists Google Home, SmartThings and Home Assistant support. The Third Reality Water Leak Sensor works with SmartThings and Home Assistant, but needs the Smart Bridge MZ1 for Google Home and Apple Home, and has no Matter path.

Battery

The Sonoff Zigbee Water Leak Sensor is rated for 5 years on a CR2477 coin cell, which is harder to find in stores. The Third Reality Water Leak Sensor is rated for 3 years on two AAA cells you can buy anywhere.

Waterproofing

The Sonoff Zigbee Water Leak Sensor is rated IP67 and can sit in a puddle. The Third Reality Water Leak Sensor does not document an ingress rating.

Which one to buy if

Winner
Sonoff

Sonoff Zigbee Water Leak Sensor

Prime exclusive deal
$24.99
Buy on Amazon USA
  • + Rating: 4.5
  • + Battery Life: 5 years
  • + Integrations: Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • - Price: $24.99 vs $20.99
  • - On Device Alert Sound: NO vs YES

What owners say

Owners of both sensors are mostly Home Assistant and Hubitat users, and both groups describe pairing that takes a minute or two and value low enough to put one by every water source. The differences start there. Sonoff Zigbee Water Leak Sensor owners single out the IP67 housing with a tool-free battery door and automations that close a Zigbee shutoff valve on a leak; their complaints are SmartThings pairing that needed a manual workaround and the less common CR2477 cell. Third Reality Water Leak Sensor owners talk above all about the loud onboard alarm heard from another floor, and warn that the sensing screws sit slightly raised, so shallow water can miss them without spacers or the drip attachment, and that a few units went offline or drained their batteries after a year or more.

Frequently Asked Questions

Sonoff vs Third Reality: which Zigbee water leak sensor is better?

The Sonoff Zigbee Water Leak Sensor, for most setups. It supports more platforms, is IP67 rated and lasts longer on its battery. The Third Reality Water Leak Sensor is the better choice if you want a loud 120 dB alarm on the sensor itself.

What is the biggest difference between the Sonoff Zigbee Water Leak Sensor and the Third Reality Water Leak Sensor?

The local alarm. The Third Reality Water Leak Sensor has a 120 dB siren that sounds on its own, while the Sonoff Zigbee Water Leak Sensor is silent and relies on the hub for notifications.

Do the Sonoff Zigbee Water Leak Sensor and the Third Reality Water Leak Sensor need a hub?

Yes. Both are Zigbee sensors and need a Zigbee hub, such as Home Assistant with a Zigbee radio, Hubitat or SmartThings. The Third Reality Water Leak Sensor also needs its Smart Bridge MZ1 to reach Google Home or Apple Home.

Which battery do the Sonoff Zigbee Water Leak Sensor and the Third Reality Water Leak Sensor use?

The Sonoff Zigbee Water Leak Sensor uses a CR2477 coin cell rated for 5 years. The Third Reality Water Leak Sensor uses two AAA batteries rated for 3 years.

Who should buy the Sonoff Zigbee Water Leak Sensor?

Home Assistant, Hubitat and SONOFF users who want a waterproof, long-lasting Zigbee sensor to drive automations such as a water shutoff valve, and do not need a siren on the device.

Who should buy the Third Reality Water Leak Sensor?

Zigbee households that want every sensor to sound a loud local alarm, useful when nobody is watching the phone, and prefer standard AAA batteries.

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