Kidde WiFi Water Leak & Freeze Detector vs Third Reality Water Leak Sensor

Updated September 2026

Data from Amazon and official Kidde and Third Reality sites.

2026 verdict

Leak and freeze in one Wi-Fi puck is why the Kidde WiFi Water Leak & Freeze Detector beats the Third Reality Water Leak Sensor overall.

Winner

Kidde WiFi Water Leak & Freeze Detector

$18.43

Buy on Amazon USA

Kidde is also the more affordable option, with temperature alerts, freeze alerts, a local siren, and Google Home, Alexa, and Home Assistant, no extra hub required. The Third Reality Water Leak Sensor is the Zigbee play: SmartThings and Home Assistant natively, and Google Home, Alexa, and HomeKit only through a Smart Bridge MZ1, plus a local alarm sound. Choose the Kidde WiFi Water Leak & Freeze Detector for hub-free freeze coverage; choose the Third Reality Water Leak Sensor to stay on Zigbee with the widest assistant bridging.

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Feature	Kidde WiFi Water Leak & Freeze Detector	Third Reality Water Leak Sensor	Winner
Price	$18.43	$20.99	Kidde WiFi Water Leak & Freeze Detector
Integrations	Google Home, Alexa, Home Assistant	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant	Third Reality Water Leak Sensor
Sensors	Water Leak, Temperature	Water Leak	Kidde WiFi Water Leak & Freeze Detector
Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts	Water Leak Alerts, Low Battery Alerts	Kidde WiFi Water Leak & Freeze Detector
Rating	4.0	4.0	Tie
Warranty	1 year	1 year	Tie
Weather Resistance	NO	NO	Tie
Connectivity	2.4 GHz WiFi	Zigbee	Tie
On Device Alert Sound	YES	YES	Tie
On Device Alert Light	NO	NO	Tie

Winner

Kidde

Kidde WiFi Water Leak & Freeze Detector

$18.43

Buy on Amazon USA

+ Price: $18.43
+ Sensors: Water Leak, Temperature
+ Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- Integrations: Google Home, Alexa, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant

Third Reality

Third Reality Water Leak Sensor

$20.99

Buy on Amazon USA

+ Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant
- Price: $20.99 vs $18.43
- Sensors: Water Leak vs Water Leak, Temperature

Frequently Asked Questions

Which is better overall, the Kidde WiFi Water Leak & Freeze Detector or the Third Reality Water Leak Sensor?

The Kidde WiFi Water Leak & Freeze Detector wins overall on price, temperature and freeze sensing, a local siren, and hub-free Wi-Fi to Google Home, Alexa, and Home Assistant. The Third Reality Water Leak Sensor is the Zigbee option with broader bridging through a Smart Bridge MZ1.

What is the biggest difference between these two water leak sensors?

Kidde is a hub-free 2.4 GHz Wi-Fi leak-and-freeze detector. The Third Reality Water Leak Sensor is a Zigbee leak puck with a local siren and no temperature sensor, unless you add Third Reality's Smart Bridge MZ1 for extra assistants.

Does Third Reality detect freeze the way Kidde does?

No. The Kidde WiFi Water Leak & Freeze Detector includes temperature and freeze alerts. The Third Reality Water Leak Sensor is leak-only.

Which one supports SmartThings natively?

The Third Reality Water Leak Sensor lists native SmartThings and Home Assistant. The Kidde WiFi Water Leak & Freeze Detector lists Google Home, Alexa, and Home Assistant, not SmartThings.

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

Anyone who wants a Wi-Fi leak-and-freeze detector with a local siren and no extra hub.

Who should buy the Third Reality Water Leak Sensor?

Zigbee households that want a leak puck with a local alarm, especially on SmartThings or Home Assistant.

Full comparison table

Compare all 32 Water Leak Sensors side by side

You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.