Shelly Flood S Gen4 slim water leak sensor, top view
Shelly Flood S Gen4, raised front view
Shelly Flood S Gen4, underside with the detection pads
Shelly Flood S Gen4 on a wet floor
Shelly Flood S Gen4 placed in front of a fridge

Shelly Flood S Gen4: slim IP67 water leak sensor with phone alerts

Regular price€21,01
/
Tax included. Shipping calculated at checkout.

  • 4 in stock
  • Backordered, shipping soon

At Q-TECH, we apply the same clear rules for everyone: the law protects you, and when applied correctly, it protects us as well. By processing your purchase, you accept our General Terms and Conditions of Sale. If you are purchasing as a consumer (B2C), nothing stated herein limits the rights granted to you by mandatory law (RDL 1/2007, TRLGDCU): the 3-year legal warranty of conformity and the right of withdrawal under the terms and with the exceptions legally provided, which are detailed below. References to "B2B" apply only to businesses and professionals.

Your guarantees

  • Rights intact: 14 days of withdrawal from receipt for most products—subject to the legal exceptions you will see below, such as goods made to your specifications—and a 3-year legal warranty of conformity, under the terms of the TRLGDCU.
  • Conformity with the description: we guarantee that the equipment will correspond to the published technical description and what one could reasonably expect from it (arts. 115 et seq. TRLGDCU). Images and videos are for guidance only: the manufacturer may supply a more recent revision of the product or introduce minor aesthetic, packaging, or firmware changes, without this constituting a lack of conformity as long as the described characteristics and performance are maintained.
  • Traceability that also protects you: we document the condition, serial number, and seal of each piece of equipment upon shipment, and we video-record the opening of returns; this is your proof of the condition in which the goods were delivered.

Responsible use and your part

  • If you are thinking of returning it, keep it as you received it: without installing or activating it, with its seals, accessories, and packaging intact. This is how to ensure a full refund, without deductions.
  • Handling that exceeds inspection reduces value: handling the equipment beyond what is necessary to verify its nature and operation may result in a real, assessed, and case-by-case justified deduction (art. 108.2 TRLGDCU), never a fixed percentage. In particular: activating or registering the serial number, linking it to a manufacturer's account or app, circulating water through hydraulic equipment, unsealing probes, or installing software or consumables. Initial inspection of the product does not lead to a deduction.
  • The same item must be returned: withdrawal requires returning the supplied unit. Different equipment, or equipment with prior use, age, or wear prior to purchase, does not constitute a valid withdrawal.
  • Installation and cybersecurity, shared responsibility: this is technical hardware; you are responsible for correct installation, credentials, patches, and backups, while we deliver a compliant product. Q-TECH is not liable for damages resulting from poor installation, incorrect configuration, or omission of patches by the customer or third parties (in B2C, without prejudice to the legal warranty and liability for intent or negligence, arts. 86 and 130 TRLGDCU).
  • Delivery of bulky goods: delivery is made to the curb. B2C: transport risk is ours until physical delivery (art. 66 ter); we recommend noting visible damages on the delivery note and notifying us of breakages within 24-48 hours with photographs to activate the insurance. B2B: inspection and notation on the delivery note are mandatory; hidden damages must be reported within 24 hours (art. 366 CCom). Unjustified rejection or incorrect shipping information will entail the actual outbound and return costs (approx. €85-550 for heavy machinery).

Made to your measure (Advanced Pre-Assembly)

  • If your order includes equipment, racks, hydraulic assemblies, or technical rooms made or configured according to your specifications (permanent joints, custom cuts or wiring, parameterization, pressure testing), these are custom goods without the right of withdrawal from the conclusion of the contract (art. 103.c TRLGDCU; CJEU Case C-529/19), which is informed before purchasing and documented in the signed Order Note. A test you request without permanent modification retains your right of withdrawal, with only the actual loss of value caused by that test being deducted. Would you prefer to receive it tested, configured, and ready to connect, without assuming these risks? Contract our Advanced Pre-Assembly or the prior technical audit.

If you are purchasing as a business or professional (B2B)

  • The transaction is governed by the Commercial Code: firm sale, without the right of withdrawal; notification of defects within 4 days (apparent) / 30 days (hidden), arts. 336 and 342. Q-TECH acts as a distributor and excludes indirect damages, loss of profit, and data loss, limited to the price of the equipment, without prejudice to the manufacturer's commercial warranty.

Product warnings v1.0 · June 2026. Information summary; the complete and binding conditions are those published at q-tech.es.

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Shelly Flood S Gen4: slim water leak sensor that alerts your phone

The Shelly Flood S Gen4 detects water under washing machines, dishwashers or fridges and alerts you on your phone and with its buzzer. It is slim, runs on a battery and connects over Wi-Fi with no gateway. At Q-Tech we set it up with the Neo valve so the water shuts off automatically.

Summary

TypeSmart water leak sensor, battery powered
Brand and modelShelly Flood S Gen4 (S4SN-0071Z)
UseUnder appliances, next to pipes and in hard-to-reach corners
DetectionLarge stainless steel pads
ProtectionIP67
ConnectivityWi-Fi 6, Bluetooth 5 LE, Zigbee 3.0 and Matter over Wi-Fi
Power1 CR123A battery included, about 2 years according to Shelly
Warranty3-year manufacturer's warranty (Shelly Gen4 devices)
Q-Tech installationPlacement, alerts and shut-off scene by the on-site hourly Expert Technician

What is the Shelly Flood S Gen4?

The Shelly Flood S Gen4 from Shelly is a low-profile water leak sensor that detects water with its metal pads, including clean water. It sounds locally and sends the alert to the Shelly Smart Control app.

Technical data

ModesFlood and rain
Alarm profilesIntense, normal and economic
Status checkEvery 5 seconds
Dimensions23 × 77 mm (height × diameter)
Weight70 g with battery
Operating temperatureFrom −20 to 40 °C
Wi-Fi rangeUp to 30 m indoors

Data according to Shelly.

Compatibility and limits

  • No sensing cable port: to cover a wide area, choose the Flood Gen4.
  • It alerts you but does not shut off the water on its own: for that you need the Neo Smart Water Valve.
  • High humidity and condensation can cause false alarms; this is avoided by increasing the state hold time, up to 60 seconds.

When this product is not the right choice

ProductWhen to choose itKey data
Shelly Flood Gen4You want to monitor a wide area or the length of a pipe2 m sensing cable, extendable to 150 m
UniFi SuperLink EnvironmentalYour installation is UniFi and you want the alert in UniFi ProtectNeeds a UniFi SuperLink gateway

Frequently asked questions

Do I need a gateway?

No. It connects to your network over Wi-Fi. It also supports Zigbee and Matter.

Does it shut off the water if it detects a leak?

Not on its own: it alerts you and sounds. With the Neo Smart Water Valve the water supply can be closed automatically.

What is the delivery time?

We have it in stock at our warehouse.

Can I install it myself?

Yes. You place it on the floor and add it to the app. Q-Tech can help if you want the shut-off scene with the valve.

Q-Tech installation and support

Our on-site hourly Expert Technician places the sensor where a leak would cause most damage and leaves the alert and shut-off set up. For remote questions there is the technical call.

More devices in Shelly water leak detection, and questions on WhatsApp.

Documentation

Availability and lead times: this item is in stock at our warehouse. Occasionally, depending on the time of year, the stock update may contain an error. If no units are available when you place your order, we will order it urgently and inform you immediately of the updated delivery time.

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