Shelly Flood Gen4, WiFi, Bluetooth, Zigbee, Matter Smart Flood Sensor with Leak Sensor Cable, Alexa, SmartThings, Google Home…
Shelly
Best for
Best Matter / Thread
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 1 trusted source
Current price
$39.99
Updated May 18, 2026 · 1 min read
Sources behind this verdict
11 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the Shelly Flood Gen4 stands out as the most protocol-flexible leak sensor in this roundup. PCMag's review calls it 'an affordable, highly versatile water leak detector with Matter support, multiple wireless options, and reliable alerts.' r/ShellyUSA and r/homeassistant threads confirm the Gen4's claimed ability to operate as Wi-Fi, Bluetooth, Zigbee, or Matter, which is unusual in this price bracket and makes it appealing to Home Assistant users who want to keep their options open. The killer feature reviewers single out is the included leak-sensing cable, which extends detection well beyond the footprint of a single puck — useful along the base of a water heater, behind a washing machine, or under a long counter run.
What reviewers liked
- PCMag praises Matter support and multi-protocol flexibility (Wi-Fi, Bluetooth, Zigbee)
- Includes a leak-detection cable for extended floor coverage
- r/homeassistant users highlight it as a future-proof choice for Matter-based smart homes
- Works with Alexa, SmartThings, Google Home, and Apple Home via Matter
- Long detection range cited in mainstream coverage
Where it falls short
- Shelly community Facebook posts flag the sensor cable not laying flat in real-world installs
- r/ShellyUSA threads mention setup friction, particularly with Wi-Fi pairing
- Amazon rating (4.2) is the lowest of the picks on this list
- IP44 rating is lower than the IP65/IP66 competition
- Matter implementation still maturing across smart-home platforms
Across the reviewers we read, the Shelly Flood Gen4 stands out as the most protocol-flexible leak sensor in this roundup. PCMag's review calls it 'an affordable, highly versatile water leak detector with Matter support, multiple wireless options, and reliable alerts.' r/ShellyUSA and r/homeassistant threads confirm the Gen4's claimed ability to operate as Wi-Fi, Bluetooth, Zigbee, or Matter, which is unusual in this price bracket and makes it appealing to Home Assistant users who want to keep their options open.
The killer feature reviewers single out is the included leak-sensing cable, which extends detection well beyond the footprint of a single puck — useful along the base of a water heater, behind a washing machine, or under a long counter run. Coverage from 9to5mac.com (unknown trust, treated as corroboration) frames it as a meaningful upgrade for Apple Home users specifically because of the Matter bridge.
Honest disagreement to surface: a Shelly community Facebook post flags real-world complaints about the leak sensor cable not laying flat against the floor, which can compromise contact detection. The 4.2-star Amazon average reflects mixed setup experiences — r/ShellyUSA threads mention Wi-Fi pairing friction in some cases. For buyers who specifically want Matter and cable-based detection, the consensus is that the trade-offs are worth it; for plug-and-play simplicity, it's not the easiest pick.
- Shelly Flood Gen4 Smart Flood Sensor - equipped with a precision leak sensor cable, it’s designed to detect water leaks early and prevent costly damage. Receive instant real-time alerts straight to your phone and seamlessly integrate it into your smart home system. Perfect for basements, kitchens, garages, laundry rooms, holiday homes, or any area at risk of leaks or flooding.
- Complete Leak Protection - Protect your home from unexpected water damage with the Shelly Flood Gen4. Simply place it beneath appliances prone to leaks. Like your dishwasher, washing machine, or sink and let it do the rest. The extendable leak sensor cable covers a wider area, detecting even the smallest amount of water the instant it appears. You’ll receive real-time alerts on your phone and can trigger local alarms to stop damage before it begins - whether you’re at home or miles away.
- Protect Your Basement or Garage from Flood Damage - Basements and garages are especially prone to leaks and flooding. The Shelly Flood Gen4 offers reliable protection by detecting water the moment it appears. Place it in vulnerable spots like corners, near drains, or along pipes to catch issues early. With customizable alert modes and extended coverage, you’ll receive instant notifications even when you’re away, allowing you to respond quickly and prevent costly damage.
- Peace of Mind for Your Vacation Property - Don’t let a small leak turn your getaway into a disaster. The Shelly Flood Gen4 is battery-operated, providing continuous monitoring and control via the Shelly Smart Control app or other home automation platforms. Install it in seasonal homes, cabins, or remote properties and enable the “Economic Alarm Mode” to conserve battery life while keeping your property protected even when it’s unattended for months.
- Shelly is one of the fastest-growing Smart Home brands, offering automation solutions for homes, buildings, and businesses. Device include a 3-year warranty and professional support. With the Shelly Smart Control App, you can configure and manage devices remotely, get real-time notifications, and create personalized scenes by combining Shelly devices to trigger automated actions across your smart home.
The Shelly Flood Gen4 is an affordable, highly versatile water leak detector with Matter support, multiple wireless options, and reliable alerts that make it an excellent choice for protecting your home from water damage.
My dishwasher feed hose developed a leak and flooded my entire kitchen, ruined the flooring. Needless to say, i'll be installing these around ...
The sensor should sound and, if you've connected it to your Shelly account, you'll get an email notification as well as an alarm buzzer from all ...
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