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Water Leak Sensors · Head to head

Heiman Smart Water Leakage Sensor vs Shelly Flood

Full Smart Water Leak Sensors comparison in 2026

Updated November 2026
Data from the official Heiman and Shelly sites.
2026 verdict
For a sensor you want to forget about for years under a sink, the Heiman Smart Water Leakage Sensor wins this pair.
Heiman Smart Water Leakage Sensor
Winner
Heiman Smart Water Leakage Sensor
$16.99$19.9915% OFFPrime exclusive deal
Buy on Amazon USA
It costs less, carries a documented IP67 seal, and its roughly 5-year CR123A battery beats the Shelly Flood's 1.5 years by a wide margin, all while sounding a local alarm with a light the Shelly Flood does not have. The Shelly Flood answers with a longer 2-year warranty, temperature sensing with freeze alerts, and broader integrations across Google Home, Samsung SmartThings and Home Assistant, all with no local horn of its own. Pick the Heiman Smart Water Leakage Sensor to hear the leak and stop thinking about the battery; pick the Shelly Flood when freeze sensing and Google Home or SmartThings support in the same Wi-Fi puck matter more.
vs
Works with
Connectivity
  • Wi-Fi 2.4 GHz
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The biggest differences

Where these two are furthest apart, and by how much.

  • Battery Life6.7×Heiman Smart Water Leakage Sensor10 years vs 1.5 years
  • Warranty2×Shelly Flood2 years vs 1 year
FeatureHeiman Smart Water Leakage SensorShelly FloodWinner
Price$16.99€25.40Heiman Smart Water Leakage Sensor
Rating4.23.8Heiman Smart Water Leakage Sensor
Warranty1 year2 yearsShelly Flood
Battery Life10 years1.5 yearsHeiman Smart Water Leakage Sensor
AlertsWater Leak Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsShelly Flood
On Device Alert SoundYESNOHeiman Smart Water Leakage Sensor
On Device Alert LightYESNOHeiman Smart Water Leakage Sensor
ConnectivityOther2.4 GHz WiFiTie
IntegrationsNoneGoogle Home, Samsung SmartThings, Home AssistantTie
SensorsWater Leak, TemperatureWater Leak, TemperatureTie

What the differences mean

Temperature and freeze

The Shelly Flood tracks temperature alongside water leaks with freeze alerts. The Heiman Smart Water Leakage Sensor detects water leaks only.

Local alarm

The Heiman Smart Water Leakage Sensor has both an on-device alarm sound and a light. The Shelly Flood has neither.

Battery life

The Heiman Smart Water Leakage Sensor is rated for about 5 years on its CR123A cell, more than three times the Shelly Flood's roughly 1.5 years.

Platform reach

The Shelly Flood adds Google Home and Samsung SmartThings on top of Home Assistant. The Heiman Smart Water Leakage Sensor reaches Home Assistant and partial SmartThings only.

Warranty

The Shelly Flood is covered for 2 years against 1 year on the Heiman Smart Water Leakage Sensor.

Which one to buy if

Winner
Heiman

Heiman Smart Water Leakage Sensor

15% OFF
Prime exclusive deal
$16.99
$19.99
Buy on Amazon USA
  • + Price: $16.99
  • + Rating: 4.2
  • + Battery Life: 10 years
  • - Warranty: 1 year vs 2 years
  • - Alerts: Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts vs Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
Shelly

Shelly Flood

3% OFF
Prime exclusive deal
€25.40
€26.09
Buy on Amazon Germany
  • + Warranty: 2 years
  • + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
  • - Price: €25.40 vs $16.99
  • - Rating: 3.8 vs 4.2

What owners say

Heiman Smart Water Leakage Sensor owners repeatedly mention the 75 dB alarm being loud enough to notice from another room even with no app connected, and several say the IP67 housing gives them confidence placing it in a genuinely damp spot like right beside a water heater. Shelly Flood owners like that setup needs no app at all, just placing the battery to start a local Wi-Fi access point you configure from a phone browser, and that Home Assistant picks the sensor up automatically once it joins the network; the most repeated complaint is the sensor occasionally dropping off Wi-Fi and needing to be manually reconnected, sometimes more than once.

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, battery life, 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?

The Heiman Smart Water Leakage Sensor 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, SmartThings, and Home Assistant support.

Is the Shelly Flood the same as the Shelly Flood Gen4?

No. The Shelly Flood compared here is the earlier Wi-Fi-only model. The Shelly Flood Gen4 is a newer version that adds Zigbee, Bluetooth and Matter alongside Wi-Fi, a built-in buzzer and LED, and a bundled sensor cable.

Does either sensor detect freezing pipes?

The Shelly Flood does, with a temperature sensor and freeze alerts. The Heiman Smart Water Leakage Sensor is leak-only.

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, SmartThings, Home Assistant, and a 2-year warranty.

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