Winner
Updated October 2026
Data from the official Shelly and Third Reality sites.
2026 verdict
Shelly Flood S Gen4 beats Third Reality Water Leak Sensor in 2026, with its clearest edge on rating, warranty, and connectivity.
The main reason it wins is rating, warranty, and connectivity, and integrations and on device alert light strengthen that case. Choose Third Reality Water Leak Sensor only if price and battery life matter more to you than the broader advantage from Shelly Flood S Gen4. That keeps the verdict firmly in favor of Shelly Flood S Gen4.
vs
$20.99
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Connectivity
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| Feature | Shelly Flood S Gen4 | Third Reality Water Leak Sensor | Winner |
|---|---|---|---|
| Price | $27.99 | $20.99 | Third Reality Water Leak Sensor |
| Rating | 4.4 | 4.1 | Shelly Flood S Gen4 |
| Warranty | 3 years | 1 year | Shelly Flood S Gen4 |
| Battery Life | 2 years | 3 years | Third Reality Water Leak Sensor |
| Connectivity | 2.4 GHz WiFi, Bluetooth, Zigbee | Zigbee | Shelly Flood S Gen4 |
| Integrations | Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant | Shelly Flood S Gen4 |
| On Device Alert Light | YES | NO | Shelly Flood S Gen4 |
| Sensors | Water Leak | Water Leak | Tie |
| Alerts | Water Leak Alerts, Low Battery Alerts | Water Leak Alerts, Low Battery Alerts | Tie |
| On Device Alert Sound | YES | YES | Tie |
Winner
$27.99
- + Rating: 4.4
- + Warranty: 3 years
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
- - Price: $27.99 vs $20.99
- - Battery Life: 2 years vs 3 years
$20.99
- + Price: $20.99
- + Battery Life: 3 years
- - Rating: 4.1 vs 4.4
- - Warranty: 1 year vs 3 years
Frequently Asked Questions
Which is better overall: Shelly Flood S Gen4 or Third Reality Water Leak Sensor?
Shelly Flood S Gen4 has the stronger overall profile in this comparison, especially for rating, warranty, and connectivity.
What is the biggest difference between Shelly Flood S Gen4 and Third Reality Water Leak Sensor?
Price is one of the clearest differences: Shelly Flood S Gen4 lists $27.99, while Third Reality Water Leak Sensor lists $20.99.
Which one looks better on price?
Shelly Flood S Gen4 is listed at $27.99, while Third Reality Water Leak Sensor is listed at $20.99. Third Reality Water Leak Sensor (better spec).
Who should buy Shelly Flood S Gen4?
Choose Shelly Flood S Gen4 if your priority is rating and warranty and that matters more than price.
Who should buy Third Reality Water Leak Sensor?
Choose Third Reality Water Leak Sensor if your priority is price and battery life and that matters more than rating.
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Compare all 34 Water Leak Sensors side by side
You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 34 Water Leak Sensors
- 36 specs compared
- 33 filters
- Water Leak Sensors
Water Leak Sensor 4
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Water Leak Sensor 1
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Wi-Fi Water Leak Detector
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Tapo T300
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Water Guard
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Water Leak Sensor
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Water and Freeze Sensor
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Zigbee Water Leak Sensor
- Water Leak Sensors
Water Leak Detector 2
- Water Leak Sensors
Water Leak Sensor T1
- Water Leak Sensors
Flood S Gen4
- Water Leak Sensors
Water Leak Detector (Sensor Cable Edition)
- Water Leak Sensors
Water Leak Detector
- Water Leak Sensors
Flood Sensor (Z-Wave)
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Water Sensor Alarm
- Water Leak Sensors
Flood & Freeze Sensor E20
- Water Leak Sensors
Smart Water Leakage Sensor
- Water Leak Sensors
Flood Sensor (HomeKit)
- Water Leak Sensors
Water Leak Sensor
- Buttons
BLU Button Tough 1 ZB
- Buttons
BLU RC Button 4 ZB
- Cameras
Camera
- Displays
Wall Display X1i
- Displays
Wall Display XL
- Displays
Wall Display
- Door & Window Sensors
BLU Door/Window Outdoor ZB
- Door & Window Sensors
BLU Door/Window ZB
- Energy Monitors
3EM-63W Gen3
- Energy Monitors
EM Gen3
- Energy Monitors
EM Gen4
- Energy Monitors
EM Mini Gen4
- Energy Monitors
Pro 3EM 3CT63
- Energy Monitors
Pro 3EM-400
- Energy Monitors
Pro 3EM v2
- Energy Monitors
Pro EM-50
- Gas Detectors
GAS (CNG)
- Gas Detectors
GAS (LPG)
- LED Bulbs
Multicolor Bulb E27 Gen3
- Motion Sensors
BLU Motion ZB
- Air Quality Monitors
Smart Air Quality Sensor
- Buttons
Smart Button ZB2
- Buttons
Smart Button
- Dongles
USBC-Dongle
- Garage Door Openers
Smart Garage Door Opener
- LED Bulbs
Smart Color Bulb ZB3
- LED Bulbs
Smart Color Bulb ZL2
- Presence Sensors
Smart Presence Sensor R2
- Presence Sensors
Smart Presence Sensor R3
- Presence Sensors
Smart Timer Light TL2
- Vibration Sensors
Vibration Sensor
- Wall Outlets
Smart Wall Outlet ZW1
- Water Leak Sensors
Smart Water Leak Sensor WL2
- Water Leak Sensors
Water Leak Sensor
- Window Coverings
Smart Blind Gen2
- Window Coverings
Smart Blind