Heiman Smart Water Leakage Sensor vs Shelly Flood (2026)

Updated September 2026

Data from Amazon and official Heiman and Shelly sites.

2026 verdict

A sealed siren with a 5-year cell is Heiman's case.

Winner

Heiman Smart Water Leakage Sensor

$15.99$19.9920% OFF

Buy on Amazon USA

The Heiman Smart Water Leakage Sensor wins this water leak sensor matchup on price, IP67 sealing, a 5-year CR123A battery, and both a local alarm sound and a status light on hub-free Wi-Fi. The Shelly Flood keeps a 2-year warranty, temperature and freeze alerts, and broader integrations (Google Home, Alexa, SmartThings, Home Assistant) with no local horn. Pick the Heiman Smart Water Leakage Sensor to hear the leak and forget the battery; pick the Shelly Flood when freeze sensing and SmartThings in the same Wi-Fi puck matter more.

Winner

Heiman

Heiman Smart Water Leakage Sensor

20% OFF

$15.99

$19.99

Buy on Amazon USA Buy on Amazon Canada

Shelly

Shelly Flood

$24.99

Buy on Amazon USA

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Feature	Heiman Smart Water Leakage Sensor	Shelly Flood	Winner
Price	$15.99	$24.99	Heiman Smart Water Leakage Sensor
Rating	4.2	3.8	Heiman Smart Water Leakage Sensor
Warranty	1 year	2 years	Shelly Flood
Weather Resistance	IP67	NO	Heiman Smart Water Leakage Sensor
Battery Life	5 years	1.5 years	Heiman Smart Water Leakage Sensor
Integrations	Samsung SmartThings, Home Assistant	Google Home, Alexa, Samsung SmartThings, Home Assistant	Shelly Flood
Sensors	Water Leak	Water Leak, Temperature	Shelly Flood
Alerts	Water Leak Alerts, Low Battery Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Shelly Flood
On Device Alert Sound	YES	NO	Heiman Smart Water Leakage Sensor
On Device Alert Light	YES	NO	Heiman Smart Water Leakage Sensor
Connectivity	2.4 GHz WiFi	2.4 GHz WiFi	Tie

Winner

Heiman

Heiman Smart Water Leakage Sensor

20% OFF

$15.99

$19.99

Buy on Amazon USA Buy on Amazon Canada

+ Price: $15.99
+ Rating: 4.2
+ Weather Resistance: IP67
- 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
+ Sensors: Water Leak, Temperature
- Price: $24.99 vs $15.99
- Rating: 3.8 vs 4.2

Frequently Asked Questions

Which is better overall: the Heiman Smart Water Leakage Sensor or the Shelly Flood?

The Heiman Smart Water Leakage Sensor wins overall on price, IP67 sealing, a 5-year battery, and a local siren plus status light. The Shelly Flood wins on a 2-year warranty, freeze sensing, and broader platform support.

What is the biggest difference between these two Wi-Fi leak sensors?

Heiman is a sealed leak alarm with a local siren and no thermometer. The Shelly Flood is a Wi-Fi leak-and-freeze puck with no on-device sound, plus Google Home, Alexa, SmartThings, and Home Assistant.

Does the Heiman Smart Water Leakage Sensor detect freeze?

No. The Heiman Smart Water Leakage Sensor is leak-only. The Shelly Flood includes temperature and freeze alerts.

Which battery lasts longer?

The Heiman Smart Water Leakage Sensor is rated for about 5 years on a CR123A cell. The Shelly Flood is rated for about 1.5 years on a CR123A cell that is not included.

Who should buy the Heiman Smart Water Leakage Sensor?

Buyers who want a loud, IP67 Wi-Fi leak detector with a long-life battery and Home Assistant, and who do not need freeze sensing.

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.

Full comparison table

Compare all 32 Water Leak Sensors side by side

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