Kidde WiFi Water Leak & Freeze Detector vs Shelly Flood

Updated September 2026

Data from Amazon and official Kidde and Shelly sites.

2026 verdict

A local siren plus freeze alerts give the Kidde WiFi Water Leak & Freeze Detector the edge over the Shelly Flood.

Winner

Kidde WiFi Water Leak & Freeze Detector

$18.43

Buy on Amazon USA

Both are hub-free 2.4 GHz Wi-Fi water leak sensors with temperature sensing, but Kidde is cheaper, better reviewed, and actually sounds an on-device alarm. Shelly Flood keeps a 2-year warranty and broader platform coverage, adding SmartThings alongside Google Home, Alexa, and Home Assistant. Neither is HomeKit or Matter. Pick the Kidde WiFi Water Leak & Freeze Detector when you want to hear the leak in the room; pick the Shelly Flood when SmartThings and a longer warranty matter more than a horn.

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Feature	Kidde WiFi Water Leak & Freeze Detector	Shelly Flood	Winner
Price	$18.43	$24.99	Kidde WiFi Water Leak & Freeze Detector
Rating	4.0	3.8	Kidde WiFi Water Leak & Freeze Detector
Warranty	1 year	2 years	Shelly Flood
Integrations	Google Home, Alexa, Home Assistant	Google Home, Alexa, Samsung SmartThings, Home Assistant	Shelly Flood
Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Kidde WiFi Water Leak & Freeze Detector
On Device Alert Sound	YES	NO	Kidde WiFi Water Leak & Freeze Detector
Weather Resistance	NO	NO	Tie
Connectivity	2.4 GHz WiFi	2.4 GHz WiFi	Tie
Sensors	Water Leak, Temperature	Water Leak, Temperature	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
+ Rating: 4.0
+ Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- Warranty: 1 year vs 2 years
- Integrations: Google Home, Alexa, Home Assistant vs Google Home, Alexa, Samsung SmartThings, Home Assistant

Shelly

Shelly Flood

$24.99

Buy on Amazon USA

+ Warranty: 2 years
+ Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant
- Price: $24.99 vs $18.43
- Rating: 3.8 vs 4.0

Frequently Asked Questions

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

The Kidde WiFi Water Leak & Freeze Detector wins overall on price, a local siren, and a stronger owner rating, with the same Wi-Fi freeze-sensing idea as Shelly. The Shelly Flood wins on a 2-year warranty and SmartThings support.

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

Kidde sounds an on-device alarm. The Shelly Flood does not. Both use hub-free 2.4 GHz Wi-Fi and both include temperature and freeze alerts.

Which one works with SmartThings?

The Shelly Flood lists SmartThings along with Google Home, Alexa, and Home Assistant. The Kidde WiFi Water Leak & Freeze Detector lists Google Home, Alexa, and Home Assistant, not SmartThings.

Do they need a hub?

No. Both the Kidde WiFi Water Leak & Freeze Detector and the Shelly Flood join 2.4 GHz Wi-Fi directly.

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

Buyers who want a cheaper Wi-Fi leak-and-freeze detector they can hear in the room, with Google Home, Alexa, and Home Assistant.

Who should buy the Shelly Flood?

Homes that want a Wi-Fi leak-and-freeze puck with a 2-year warranty and SmartThings in the same integration list.

Full comparison table

Compare all 32 Water Leak Sensors side by side

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