• Shelly Flood S Gen4 water leak sensor - main product image
  • Shelly Flood S Gen4 water leak sensor - back view
  • Shelly Flood S Gen4 water leak sensor - front view
  • Shelly Flood S Gen4 water leak sensor - back view
  • Shelly Flood S Gen4 water leak sensor - installed in a real home setting
  • Shelly Flood S Gen4 water leak sensor - installed in a real home setting
  • Shelly Flood S Gen4 water leak sensor - installed in a real home setting
1 7

Shelly

Shelly Flood S Gen4. Matter, Wi-Fi & Zigbee Smart Water Leak Sensor with Built-in Buzzer

Shelly Flood S Gen4. Matter, Wi-Fi & Zigbee Smart Water Leak Sensor with Built-in Buzzer

Flood S Gen4

Condition: New

Ask for Dealer Price
$27.99 USD
$27.99 USD $27.99 USD
Sale Sold out
Shipping calculated at checkout.
Retail: Get Free Shipping using code FREESHIP at checkout on orders from USD 200 (for US Continental, exclusions applies*).
Shipping to Canada or International? Take advantage of new flat rates.
(*)See terms & conditions

Need more quantity? We have it! Contact us and we will get it for you
100% Secure Payments

Catch leaks early, before they become costly damage. The Shelly Flood S Gen4 is a compact, battery-powered water leak sensor with a unique large-surface triple-pad stainless-steel design that detects even clean or low-conductivity water, like air conditioning condensate or distilled water. Get instant remote alerts and a loud local alarm from the built-in buzzer.

WHY SHELLY FLOOD S GEN4?

Low-profile leak protection that fits anywhere

Its slim, ultra-compact design slides under washing machines, dishwashers and refrigerators, below sinks, next to toilets or inside water heater drip pans - wherever leaks are most likely to start.

With Wi-Fi 6, Bluetooth 5 LE, Zigbee 3.0 and Matter, the Shelly Flood S Gen4 integrates with Shelly Smart Control, Home Assistant and other popular platforms, so a detected leak can instantly trigger a notification or an automation such as closing a smart water valve.

KEY FEATURES

  • Flexible connectivity: choose between Wi-Fi, Zigbee and Bluetooth
  • Matter-certified: integrates into any Matter ecosystem
  • Detects all water: including clean or low-conductivity water such as AC condensate or distilled/desalinated water
  • IP67 protection: built for splash- and spill-prone areas
  • Two modes: Flood detection or Rain detection for outdoor automations
  • Three alarm profiles: Intense, Normal and Economic
  • Built-in buzzer: immediate audible warning on the spot
  • Long battery life: CR123A battery included, up to 2 years
  • Local automations: keeps working even without cloud access
View full details

Gen4 devices

Experience next-level smart home automation with Shelly Gen4 novelties.
Each Gen4 device offers multi-protocol connectivity, featuring Wi-Fi, Bluetooth, Zigbee, and Matter.
Choose your connection and set up your Shelly device to work with your preferred smart home network in no time.

Common Use Cases

  • Under-Appliance Leaks

    Slide the low-profile sensor under washers, dishwashers or refrigerators to catch leaks at the source.

  • Under-Sink Drips

    Place it flat beneath P-traps, shutoff valves or filters to detect slow drips early.

  • Toilet Seal Failures

    Position it beside or behind toilets to detect leaks from supply lines, tanks or wax rings.

  • Water Heater Pans

    Set it inside a drip pan for an immediate alert if the pan fills or overflows.

  • Automatic Water Shutoff

    Pair it with a smart water valve to cut the water supply automatically when a leak is detected.

  • Rain Automations

    Use Rain mode outdoors to pause irrigation, retract awnings or close skylights when it rains.

Functionalities

  • Spot Leak Detection

    Quickly identifies even small leaks via a large-surface stainless-steel triple-pad sensor, ideal for tight spaces.

  • Two Modes

    Choose between Flood Detection and Rain Detection to match your environment.

  • Instant Remote Alerts

    Receive notifications the moment water is detected, so you can act immediately - wherever you are.

  • Built-in Buzzer

    Get an immediate audible warning when you are nearby, thanks to the integrated buzzer.

  • Local Automations

    Trigger actions locally and keep protection running even without cloud access.

  • Broad Compatibility

    Works with third-party home automation systems and the Shelly Smart Control app.

Frequently Asked Questions

What kind of water can the Shelly Flood S Gen4 detect?

How long does the battery last?

Does it work with Matter and Zigbee?

Will it sound an alarm locally?

Can it be used outdoors?

No hub required, Universally compatible

Shelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed with Wi-Fi Protocol.(*)
Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system.

(*) Platform app / Hub required when used with Zigbee / Matter

Shelly App
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms

No hub required, Universally compatible

Shelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed with Wi-Fi Protocol.(*)
Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system.

(*) Platform app / Hub required when used with Zigbee / Matter

Shelly App
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Specifications

DEVICE
ModelS4SN-0071Z
PHYSICAL
Size (HxD)23 x 77 mm / 0.91 x 3.03 in
Weight50 g (without battery) / 70 g (with battery)
MountingFlat surface
Shell colorWhite
Ingress protectionIP67
ENVIRONMENTAL
Ambient working temperature-20°C to 40°C / -5°F to 105°F
Humidity30% to 100% RH
ELECTRICAL
Power supplyBattery
Battery type1 x CR123A (included)
Estimated battery lifeApprox. 2 years
FUNCTIONS
Water detectionYes - stainless-steel triple pads
ModesFlood / Rain
Alarm profilesIntense / Normal / Economic
BuzzerYes
RADIO
Wi-Fi802.11 b/g/n/ax (Wi-Fi 6), up to 30 m indoors
Bluetooth5 (LE), up to 10 m indoors
Zigbee802.15.4, up to 100 m indoors
MatterYes (over Wi-Fi)
FIRMWARE
CPU / FlashESP-Shelly-C68F / 8 MB
Webhooks10 with 2 URLs per hook
MQTT / UDP / KVSYes / Yes / Yes

Warranty

New Products

  • USA Pro Market Manufacturer Warranty: Lifetime manufacturer warranty (only if installed by a professional within USA) when purchased at Digital Bay Tech.

  • Retail Standard Manufacturer Warranty (included in purchase price): 2, 3 or 5 years manufacturer warranty covers only the hardware (corpus, mechanics, and display, if any) and does not cover consumables (battery) and accessories insofar as these are subject to exhaustion (decrease of their useful life) depending on the intensity of their use. Device malfunctions are only covered when device is used as described conditions within user manual (max loads, proper installation, etc.). Please check refund policy for further details.
  • Gen 1: 2 years.
  • Plus, Gen3, Gen4, Wave: 3 years.
  • Pro Line: 5 years.

Special Notes

  • Do It Yourself: Devices are technically user-installable in many locales, nevertheless consulting a licensed electrician to install shelly components is recommended; in addition to being licensed to work with electrical devices, they are also familiar with local building codes and regulations to keep your safety.
  • Manufacturer's Safety note: Each Shelly device generates heat under load. Do not combine two or more Shelly devices stacked on top of or beside each other in a confined space. There must be a minimum distance of 0.4 inch / 1 cm between them to allow for airflow.

Additional Links