Water Leak Sensors · Head to head

Resideo L1 WiFi Water Leak and Freeze Detector vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Honeywell Home and Shelly sites.
2026 verdict
For a Matter-based smart home adding leak coverage room by room, the Shelly Flood Gen4 is the water leak sensor to buy over the Resideo L1 WiFi Water Leak and Freeze Detector.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99

Last recorded price

Buy on Amazon USA
It costs less, rates higher with owners, carries a 3-year warranty against 2, and speaks WiFi, Bluetooth, Zigbee and Matter in one device, reaching Google Home natively and Apple HomeKit or SmartThings through Matter, where the Resideo L1 has no third-party platform support at all. The Resideo L1 is the fallback mainly for buyers who specifically want its longer cable chain, which extends to a maximum of 500 ft against the Shelly Gen4's fixed 2m cable, or who plan to pair several detectors with a Resideo L5 shutoff valve. The Shelly Flood Gen4 is the more capable water leak sensor across price, warranty, radios and every major platform including Matter; the Resideo L1 only wins if that cable reach or valve pairing is the point.
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FeatureResideo L1 WiFi Water Leak and Freeze DetectorShelly Flood Gen4Winner
Price$68.00$39.99Shelly Flood Gen4
Rating3.74.2Shelly Flood Gen4
Warranty2 years3 yearsShelly Flood Gen4
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsNoneGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
Weather ResistanceIP44IP44Tie
Battery Life2 years2 yearsTie
SensorsWater Leak, TemperatureWater Leak, TemperatureTie
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsTie
On Device Alert SoundYESYESTie
On Device Alert LightYESYESTie

What the differences mean

Protocol breadth

The Shelly Flood Gen4 speaks WiFi, Bluetooth, Zigbee and Matter in one device, reaching Google Home natively and Apple HomeKit or SmartThings through Matter. The Resideo L1 has only 2.4 GHz WiFi and no third-party smart home platform of any kind.

Cable reach

The Resideo L1's 5 ft cable chains with accessory cables to a maximum of 500 ft, built for a whole utility room. The Shelly Flood Gen4's included sensor cable is a fixed 2m, meant to reach one nearby spot like under a cabinet rather than cover a long run.

Warranty

The Shelly Flood Gen4 carries a 3-year warranty against the Resideo L1's 2 years.

What the automation actually triggers

The Shelly Flood Gen4's local automations can trigger any other Shelly device directly, which owners use to cut power to a pump or flash lights on a leak. The Resideo L1's automation is narrower but purpose-built: pairing up to 30 detectors with a Resideo L5 shutoff valve to close the water main.

Which one to buy if

  • you want the sensor to show up in Matter, Google Home, HomeKit or SmartThings
    Shelly Flood Gen4

    The Shelly Flood Gen4 supports all of them in one device; the Resideo L1 supports none.

  • the cable needs to reach across a genuinely long basement or utility room
    Resideo L1 WiFi Water Leak and Freeze Detector

    The Resideo L1's cable chain reaches up to 500 ft; the Shelly Flood Gen4's included cable is a fixed 2m.

  • a longer warranty and lower price matter more than protocol variety
    Shelly Flood Gen4

    It carries a 3-year warranty against the Resideo L1's 2, at the more affordable price of the two.

  • you want a leak to directly trigger another smart device, like cutting power to a pump
    Shelly Flood Gen4

    Its local automations can trigger any other Shelly device; the Resideo L1's automation is limited to pairing with its own L5 valve.

What owners say

The most common praise for the Shelly Flood Gen4 comes from Home Assistant and Zigbee2MQTT users, who describe the sensor connecting quickly and staying stable over Zigbee, with the included cable sensitive enough that a single drop of water triggers it; one owner set it up to cut power to an aquarium pump and flash lights red the moment a leak was detected. The rougher edges show up on Wi-Fi and Matter: several buyers describe the initial app-to-sensor Wi-Fi pairing as slow or finicky, and a smaller number who paired over Matter into Apple HomeKit report the leak status not refreshing automatically, needing a manual button press instead.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Resideo L1 WiFi Water Leak and Freeze Detector
  • Shelly Flood Gen4

Loading price history...

Frequently Asked Questions

Which water leak sensor should I buy: Resideo L1 WiFi Water Leak and Freeze Detector or Shelly Flood Gen4?

The Shelly Flood Gen4 is better overall, winning on the more affordable price, the stronger owner reviews, a 3-year warranty and support for WiFi, Bluetooth, Zigbee and Matter. The Resideo L1 WiFi Water Leak and Freeze Detector wins only on its longer cable reach and L5 valve pairing.

How do the Resideo L1 WiFi Water Leak and Freeze Detector and the Shelly Flood Gen4 actually differ?

Cable reach and protocol support. The Resideo L1 WiFi Water Leak and Freeze Detector chains its cable to a maximum of 500 ft but only speaks WiFi. The Shelly Flood Gen4 has a fixed 2m cable but supports WiFi, Bluetooth, Zigbee and Matter together.

Which has the longer warranty, the Resideo L1 WiFi Water Leak and Freeze Detector or the Shelly Flood Gen4?

The Shelly Flood Gen4 is covered for 3 years, against 2 years on the Resideo L1 WiFi Water Leak and Freeze Detector.

Which of the Resideo L1 WiFi Water Leak and Freeze Detector and the Shelly Flood Gen4 works with more smart home platforms?

The Shelly Flood Gen4 reaches Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant and Matter. The Resideo L1 WiFi Water Leak and Freeze Detector has no third-party smart home integrations and stays in its own app.

Who should buy the Resideo L1 WiFi Water Leak and Freeze Detector?

Buyers who specifically want a cable chain reaching up to 500 ft, or who plan to pair several detectors with a Resideo L5 shutoff valve, even though the Shelly Flood Gen4 wins overall.

Who should buy the Shelly Flood Gen4?

Most people comparing these two water leak sensors, because the Shelly Flood Gen4 wins on price, owner reviews, warranty and protocol support across WiFi, Zigbee and Matter.

Full comparison table

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