Centralite 3-Series Water Sensor vs Shelly Flood (2026)

Updated September 2026

Data from Amazon and official Centralite and Shelly sites.

2026 verdict

Runtime and a lower price keep the Centralite 3-Series Water Sensor ahead of the Shelly Flood.

Winner

Centralite 3-Series Water Sensor

$19.95

Buy on Amazon USA

Centralite lasts about 3 years on a CR2 cell versus Shelly's 1.5 years, and it confirms low-battery alerts on Zigbee for SmartThings and Home Assistant. The Shelly Flood adds a 2-year warranty and hub-free Wi-Fi to Google Home, Alexa, SmartThings, and Home Assistant, with the same temperature and freeze sensing. Neither has a local siren. Buy the Centralite 3-Series Water Sensor for a cheaper Zigbee freeze puck; buy the Shelly Flood to skip the hub and keep Google Home and Alexa.

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Feature	Centralite 3-Series Water Sensor	Shelly Flood	Winner
Price	$19.95	$24.99	Centralite 3-Series Water Sensor
Warranty	1 year	2 years	Shelly Flood
Battery Life	3 years	1.5 years	Centralite 3-Series Water Sensor
Integrations	Samsung SmartThings, 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	Centralite 3-Series Water Sensor
Rating	3.8	3.8	Tie
Weather Resistance	NO	NO	Tie
Connectivity	Zigbee	2.4 GHz WiFi	Tie
Sensors	Water Leak, Temperature	Water Leak, Temperature	Tie
On Device Alert Sound	NO	NO	Tie
On Device Alert Light	NO	NO	Tie

Winner

Centralite

Centralite 3-Series Water Sensor

$19.95

Buy on Amazon USA

+ Price: $19.95
+ Battery Life: 3 years
+ Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- Warranty: 1 year vs 2 years
- Integrations: Samsung SmartThings, 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 $19.95
- Battery Life: 1.5 years vs 3 years

Frequently Asked Questions

Which is better overall, the Centralite 3-Series Water Sensor or the Shelly Flood?

The Centralite 3-Series Water Sensor wins overall on price, a 3-year battery versus about 1.5 years, and confirmed low-battery alerts. The Shelly Flood wins on a 2-year warranty and hub-free Wi-Fi to Google Home, Alexa, SmartThings, and Home Assistant.

What is the biggest difference between these two leak-and-freeze sensors?

Zigbee hub versus hub-free Wi-Fi. The Centralite 3-Series Water Sensor needs a Zigbee hub. The Shelly Flood joins 2.4 GHz Wi-Fi directly. Both include temperature and freeze alerts, and neither has a local siren.

Which battery lasts longer?

The Centralite 3-Series Water Sensor is rated for about 3 years on a CR2 cell. The Shelly Flood is rated for about 1.5 years on a CR123A cell that is not included.

Does the Shelly Flood work with SmartThings?

Yes. The Shelly Flood lists Google Home, Alexa, SmartThings, and Home Assistant. The Centralite 3-Series Water Sensor lists SmartThings and Home Assistant only.

Who should buy the Centralite 3-Series Water Sensor?

Zigbee SmartThings or Home Assistant users who want a cheaper leak-and-freeze puck with a longer-rated battery.

Who should buy the Shelly Flood?

Homes that want a hub-free Wi-Fi leak-and-freeze sensor with Google Home, Alexa, SmartThings, Home Assistant, and a 2-year warranty.

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