Updated November 2026
Data from the official Aeotec and Shelly sites.
2026 verdict
Wanting one sensor that will talk to whichever hub you end up choosing later, the Shelly Flood Gen4 decisively beats the Aeotec Water Sensor 7 Pro in this pair.
It wins on price, a longer 3-year warranty, an IP44 weatherproof body and far more connectivity. Where the Aeotec Water Sensor 7 Pro is Z-Wave only, the Shelly Flood Gen4 supports Wi-Fi, Zigbee, Bluetooth and Matter, so it slots into Home Assistant, Google Home, HomeKit or SmartThings, and it adds a built-in buzzer and LED for local alerts plus an included extendable sensor cable. The Aeotec Water Sensor 7 Pro keeps one clear advantage, a longer roughly 3-year battery life against the Shelly's 2 years on 4x AA cells, and both track temperature with freeze alerts. Choose the Shelly Flood Gen4 for multi-protocol flexibility, an onboard alarm and a cheaper price with a longer warranty; pick the Aeotec Water Sensor 7 Pro only if maximum battery life on an existing Z-Wave hub is the priority.
Works with
Connectivity
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The biggest differences
Where these two are furthest apart, and by how much.
- Warranty3×Shelly Flood Gen43 years vs 1 year
- Battery Life+50%Aeotec Water Sensor 7 Pro3 years vs 2 years
| Feature | Aeotec Water Sensor 7 Pro | Shelly Flood Gen4 | Winner |
|---|---|---|---|
| Price | $29.99 | $39.99 | Aeotec Water Sensor 7 Pro |
| Warranty | 1 year | 3 years | Shelly Flood Gen4 |
| Weather Resistance | IP20 | IP44 | Shelly Flood Gen4 |
| Battery Life | 3 years | 2 years | Aeotec Water Sensor 7 Pro |
| Connectivity | Z-Wave | 2.4 GHz WiFi, Bluetooth, Zigbee | Shelly Flood Gen4 |
| Integrations | Samsung SmartThings, Home Assistant | Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Shelly Flood Gen4 |
| On Device Alert Sound | NO | YES | Shelly Flood Gen4 |
| On Device Alert Light | NO | YES | Shelly Flood Gen4 |
| Rating | 4.1 | 4.1 | Tie |
| Sensors | Water Leak, Temperature | Water Leak, Temperature | Tie |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | Tie |
| Local Control | YES | YES | Tie |
What the differences mean
Connectivity
The Shelly Flood Gen4 supports Wi-Fi, Zigbee, Bluetooth and Matter. The Aeotec Water Sensor 7 Pro is Z-Wave only.
Local alarm
The Shelly Flood Gen4 has a built-in buzzer and LED. The Aeotec Water Sensor 7 Pro has neither.
Weather resistance
The Shelly Flood Gen4 is rated IP44. The Aeotec Water Sensor 7 Pro is rated IP20, with no dedicated water protection on the housing.
Battery life
The Aeotec Water Sensor 7 Pro is rated for about 3 years on its ER14250 cell, longer than the Shelly Flood Gen4's roughly 2 years on 4x AA cells.
Warranty
The Shelly Flood Gen4 is covered for 3 years against 1 year on the Aeotec Water Sensor 7 Pro.
Which one to buy if
- you are not sure yet which smart home platform you will end up on
Wi-Fi, Zigbee, Bluetooth and Matter cover nearly every option; the Aeotec Water Sensor 7 Pro works only over Z-Wave.
- you already run a Z-Wave hub and mainly want the longest battery life
Its roughly 3-year rating beats the Shelly Flood Gen4's 2 years.
- you want a local alarm that can also trigger other smart devices
Its on-device automations can cut power to another Shelly device the moment a leak fires; the Aeotec Water Sensor 7 Pro has no on-device sound or automation trigger of its own.
- the spot is genuinely wet, not just damp
Its IP44 rating is documented; the Aeotec Water Sensor 7 Pro is rated IP20, with no dedicated water protection.
- you want the longer warranty alongside the lower price
The Shelly Flood Gen4 is covered for 3 years against 1 year on the Aeotec Water Sensor 7 Pro.
$29.99
- + Price: $29.99
- + Battery Life: 3 years
- - Warranty: 1 year vs 3 years
- - Weather Resistance: IP20 vs IP44
Winner
$39.99
- + Warranty: 3 years
- + Weather Resistance: IP44
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
- - Price: $39.99 vs $29.99
- - Battery Life: 2 years vs 3 years
What owners say
Aeotec Water Sensor 7 Pro owners still value how sensitive the leak detection is and how the bundled sensor cable reaches spots a bare puck cannot, but several also mention a fiddly reset-and-repair pairing sequence the first time and some report the probe corroding after months in a consistently wet spot. Shelly Flood Gen4 owners like that the on-device automations can trigger other Shelly devices directly, one describes cutting power to an aquarium pump and flashing lights red the moment a leak fires, and the cable is called out as sensitive enough to catch a single drop under a cabinet; the 3-year warranty and Shelly's general build quality come up often as reasons owners trust it for a permanent installation.
Frequently Asked Questions
Which is better overall: Aeotec Water Sensor 7 Pro or Shelly Flood Gen4?
The Shelly Flood Gen4 wins overall on price, a 3-year warranty, weatherproofing, multi-protocol connectivity (WiFi, Zigbee, Bluetooth and Matter), and an onboard buzzer and LED. The Aeotec Water Sensor 7 Pro's main advantage is a longer battery life.
What is the biggest difference between these two sensors?
Connectivity. The Shelly Flood Gen4 supports WiFi, Zigbee, Bluetooth and Matter for almost any ecosystem, while the Aeotec Water Sensor 7 Pro is limited to Z-Wave with SmartThings and Home Assistant.
Which one works with more smart home platforms?
The Shelly Flood Gen4, which reaches Home Assistant, Google Home, HomeKit and SmartThings across its protocols. The Aeotec Water Sensor 7 Pro sticks to SmartThings and Home Assistant over Z-Wave.
Which sensor lasts longer on a battery?
The Aeotec Water Sensor 7 Pro, rated for about 3 years, longer than the Shelly Flood Gen4's roughly 2 years on 4x AA cells.
Who should buy the Shelly Flood Gen4?
Buy it if you want a cheaper, multi-protocol sensor with an extendable cable, an onboard alarm, and support for WiFi, Zigbee, Bluetooth and Matter.
Who should buy the Aeotec Water Sensor 7 Pro?
Choose it if you run a Z-Wave hub and prioritize the longest battery life alongside freeze and temperature alerts and an included sensor cable.
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