WiFi Water Leak Sensor Guide for Australian Homes (2026): How It Works, Where to Put It, How to Set It Up
A WiFi water leak sensor is a small battery-powered alarm with a probe on a cable. When the probe touches water, the sensor sounds an alarm and sends an alert to your phone. It joins your home WiFi directly, so there is no hub to buy and no monthly fee.
This guide covers how it works, the best places to put one in an Australian home, how to set it up, and what to check before you buy. If you only want the product, the PureNode Smart Water Leak Sensor is the one we make and stand behind.
The short answer
- What it does: detects water at the probe, sounds an 80 dB alarm within 1 metre, and sends a notification to your phone.
- Do you need a hub? No. It joins your 2.4 GHz WiFi network directly.
- What app does it use? Tuya Smart or Smart Life, on iPhone and Android.
- Best first spots: under the kitchen sink, behind the washing machine, and beside the dishwasher.
- Biggest gotcha: it works on 2.4 GHz WiFi only, not 5 GHz. It also needs 2 x AAA batteries, which are not included.
How does a WiFi water leak sensor work?
The PureNode sensor has a main unit and a probe on a cable of about 50 cm. The probe has two short metal pins. While they are dry, the sensor stays quiet. When both pins touch water, the circuit between them completes, the built-in alarm sounds and your phone is notified through your router.
Because the sensor talks to your router directly, it needs no separate hub. The trade-off is that every WiFi device holds a connection to your router, so it suits a home with a handful of sensors. Planning a bigger system? Read our guide to Zigbee vs Matter vs WiFi first.
Where should you put a water leak sensor?
Leaks rarely start in plain sight. They start where pipes, hoses and seals are hidden behind a cupboard door or an appliance, and a slow drip can run for days before anyone notices. Put the sensor where water would collect first.
Under the kitchen sink
Under-sink pipes, traps and tap connections are among the most common sources of slow drips. Mount the main unit on the inside of the cabinet side with the supplied two-sided tape, then lay the probe flat on the cabinet floor so the pins sit at the lowest point. You are alerted early, before the cabinet base swells.
Behind the washing machine
Inlet hoses and drain hoses are a classic cause of laundry leaks. Place the probe on the floor beside or behind the machine, where water would run first. Your phone tells you about the leak even if you are at work or asleep.
Beside the dishwasher
A worn door seal or loose hose can leak slowly under a dishwasher where you cannot see it. Put the probe on the floor at the front corner or at the side of the dishwasher so it sits where water would appear first.
Other places worth a sensor
- Next to the hot water system or under a bathroom vanity.
- Beside a fridge with a water line or ice maker.
- Near an indoor pot plant tray or a laundry trough.
For more on the problems sensors catch around the house, see 5 home problems Australians fix with smart sensors.
How do you set it up?
Setup takes a few minutes.
- Add it in the app. Fit 2 x AAA alkaline batteries (not included), open Tuya Smart or Smart Life, add a device and join your 2.4 GHz WiFi network. New to the app? Our Tuya Smart beginner's walkthrough covers it step by step.
- Mount it. Fix the main unit to a wall or the side of a cabinet with the supplied two-sided mounting tape, then lay the probe where water would collect.
- Get alerts. When both metal pins touch water, the alarm sounds and your phone is notified.
Why does it only work on 2.4 GHz WiFi?
Most small smart home devices use 2.4 GHz because it travels further and passes through walls better than 5 GHz. Many Australian routers combine both bands under one network name. If yours does, keep your phone on 2.4 GHz while you pair the sensor. If pairing keeps failing, our guide on smart devices dropping offline covers the usual fixes.
What should you check before buying a water leak sensor?
| Check | Why it matters | PureNode Smart Water Leak Sensor |
|---|---|---|
| Hub needed? | A hub adds cost and a setup step | No hub, joins 2.4 GHz WiFi |
| App | Where you get your alerts | Tuya Smart or Smart Life |
| Local alarm | Makes noise at the leak, not just on your phone | 80 dB within 1 m |
| Probe | Needs to reach the lowest point | About 50 cm cable, two metal pins |
| Batteries | Dead batteries mean a dead sensor | 2 x AAA alkaline (not included), low battery reminder in the app |
| Mounting | Renters need something removable | Two-sided mounting tape supplied |
| Warranty | Who helps if it fails | 12 months from delivery, in addition to your rights under the Australian Consumer Law |
Can you use one in a rental?
Yes. The sensor is battery powered and mounts with two-sided tape, so nothing needs wiring and you can take it with you when you move.
Does a leak sensor stop the leak?
No. A water leak sensor warns you; it does not shut off water. Treat it as an early warning so you can turn off the tap or isolation valve and act before the damage spreads. It works well alongside the other sensors in our smart sensors buying guide, and you can browse the Smart Sensors collection. Pairing it with a door and window sensor covers both leaks and entry points.
Why choose the PureNode sensor?
The PureNode Smart Water Leak Sensor is a PureNode Original: it carries our own logo and arrives in our own PureNode box with a printed user guide. PureNode is an Australian-owned business run by Electro Oz Pty Ltd in Victoria. Every order ships free, the sensor has a 12-month warranty from delivery, and our 14-day returns policy applies. Questions before you buy? Email info@purenode.com.au.
Frequently asked questions
Do I need a hub for a WiFi water leak sensor?
No. It connects directly to your 2.4 GHz WiFi network and is set up in the Tuya Smart or Smart Life app.
Which apps does it work with?
Tuya Smart and Smart Life, on iOS and Android.
Does it work on a 5 GHz WiFi network?
No. It supports 2.4 GHz WiFi only. If your router combines 2.4 GHz and 5 GHz under one name, keep your phone on 2.4 GHz while pairing.
How does it detect water?
The probe has two metal pins. When both touch water, the sensor detects the leak, sounds the alarm and sends a phone alert.
How long is the probe cable?
About 50 cm.
Are batteries included?
No. It uses 2 x AAA alkaline batteries, which are not included. The app sends a low battery reminder.
How do I mount it?
Use the supplied two-sided mounting tape to fix the main unit to a wall or the side of a cabinet, and lay the probe where water would collect.
Products in this guide
Everything mentioned above
In stock and shipped free Australia-wide.
Not sure where to start?
Browse our under-A$100 picks — the essentials most people start their smart home with.