AUTOMATIZA_LAB
See ranking
#20 in Home Automation & Smart Home
Shelly Flood Gen4 — WiFi/Zigbee/Matter Water Leak Sensor with Detection Cable
Home Automation & Smart Home

Shelly Flood Gen4 — WiFi/Zigbee/Matter Water Leak Sensor with Detection Cable

4.3(262 reviews)

$39.99reference price

View on Amazon

Best for

Catching a water leak (under a water heater, washing machine, or kitchen sink) before it turns into a puddle — sends an alert to your phone no matter where you are.

  • Matter
  • Zigbee
  • WiFi/Bluetooth
  • Leak sensor

What is it and what's it for?

It's a water alarm with its own phone line: the moment the sensor cable (or the base) touches water, it doesn't just sound a local siren — it sends a notification to your phone, whether you're at work or traveling. Think of it like a smoke detector, but for water: the point isn't to hear the alarm standing next to it, it's to find out in time even when you're not home.

Real-world use cases

At home

You place it under the water heater, the pool pump, or the washing machine — if it starts dripping or fails, the alert reaches your phone before the water reaches the floor or seeps into another room.

In a business or workshop

A shop with commercial fridges or freezers (a butcher shop, fish market, bar) can place it near the drain tray or the unit's water connection — an undetected leak in a business can mean hours of cleanup and lost inventory, not just a household nuisance.

How to avoid buying the wrong one

  • The sensor cable detects along its full 2-meter length, not just at one point — useful for covering the whole perimeter of an appliance, not just under one specific pipe.
  • It's IP44: splash-resistant, but not meant to sit underwater — place it where it can catch water as it starts pooling, not at the bottom of a sump.
  • If you want to use it over Zigbee or as part of a Thread network, you need a compatible hub or coordinator at home; over WiFi/Bluetooth it works standalone, no extra hub needed.

The investment takeaway

Compared to a generic $10 water alarm that only makes noise if you're standing right next to it, this sensor alerts your phone wherever you are — the difference between finding out about a leak in 5 minutes versus 3 days later when you get back from a trip. Next to what it can cost to repair a wood floor or a ceiling damaged by water, this sensor's $40 is cheap as insurance.

Shelly Flood Gen4 — WiFi/Zigbee/Matter Water Leak Sensor with Detection Cable

$39.99reference price

See current price on Amazon

More products in this category

#1SONOFF WiFi MINI-D Smart Switch — Dry Contact, Matter Compatible

SONOFF WiFi MINI-D Smart Switch — Dry Contact, Matter Compatible

MatterDry contactAC/DC
4.7 · 957 reviews

Has a dry-contact output, not a plug-and-play outlet — it installs inside a box or panel to switch an external load, which makes it more versatile for retrofitting existing wiring than a traditional smart plug. Supports Matter, so in theory it works with any compatible hub (Apple Home, Google Home, Alexa) without relying solely on the Tuya/eWeLink app. Accepts AC or DC input, useful if your project already runs on 12V/24V DC.

$13.86reference price

See current price on AmazonSee full buying guide
#2GHome Dual Smart Plug 15A — WiFi Double Outlet

GHome Dual Smart Plug 15A — WiFi Double Outlet

WiFi 2.4GHzTuya15A
4.5 · 750 reviews

It's a ready-to-use outlet (not a module for a panel), meant for anyone who wants immediate results without wiring anything. It runs on the closed GHome/Tuya ecosystem — no dry-contact output or native Home Assistant integration without an extra bridge. A good choice if simplicity is your priority, not if you're looking to integrate it into your own Node-RED project.

$30.99reference price

Check it out on AmazonSee full buying guide
#3Smart Plug with Energy Monitoring 15A (4-pack)

Smart Plug with Energy Monitoring 15A (4-pack)

Consumption monitoringTuya4-pack
4.3 · 170 reviews

Real-time power monitoring (watts) is the differentiator over a simple plug — useful for consumption-based automations, like turning off a device when a cycle finishes. It's made by AiSeek: a real 1800W/15A rating with built-in short-circuit and overload protection, ETL and FCC certified, but 2.4GHz WiFi only (no 5GHz). The 4-pack makes it convenient to equip several points at once, but you're still dependent on the SmartLife app (Tuya-based) to configure them — and it doesn't pair directly with Alexa: you first connect it to SmartLife and link it from there as a third-party service to Alexa or Google Assistant.

$22.49reference price

Check availability on AmazonSee full buying guide
See the full ranking of Home Automation & Smart Home →