How smart water leak detectors and automatic shut-off valves work, where to put them, what they cost, insurance benefits, connectivity and privacy, and whether they're worth it for your home.
Escape of water is one of the most common causes of home insurance claims in the UK, and leaks can do serious damage before anyone notices. Smart leak detectors aim to catch problems early by sending an alert to your phone. Some systems can automatically shut off your water supply. Here's how they work and when they're worth it.
Types of leak detector
1. Spot sensors
Small battery-powered devices placed on the floor where leaks are likely. When water touches their contacts, they sound an alarm and, if connected, send an alert. They're inexpensive and easy to fit.
2. Flow monitors
Fitted to the incoming water pipe, they monitor water use and detect unusual patterns, such as continuous flow suggesting a leak, or a slow drip. Some clip on; others need a plumber.
3. Automatic shut-off valves
Fitted to the main water supply, they can turn off the water automatically when a leak is detected, or remotely from an app. Installation usually needs a plumber.
Where to place spot sensors?
- under the kitchen sink and behind the dishwasher and washing machine;
- near the boiler and hot water cylinder;
- under bathroom sinks and near toilets;
- in the loft near cold water tanks;
- near the stopcock and water meter.
Connectivity
- Wi-Fi sensors connect directly to your router, but use more battery.
- Hub-based sensors (Zigbee, Z-Wave or proprietary) use less power, but need a hub.
- Standalone alarms only beep, useful only if someone is home to hear them.
Check Wi-Fi coverage where you'll place sensors, especially in lofts and cupboards.
Are they worth it?
They're most worthwhile if:
- you're often away from home, or have a second home or rental property;
- you live in a flat, where a leak could damage neighbours' homes;
- you have older plumbing, a loft tank, or appliances in hidden spaces;
- your insurer offers a discount or supplies devices.
Some insurers have offered leak detection devices to customers, recognising the cost of escape-of-water claims. Ask yours.
Limitations
- Spot sensors only detect water that reaches them; leaks inside walls or under floors may be missed.
- Batteries need replacing; set a reminder and check low-battery alerts.
- Alerts are only useful if someone can respond or the water shuts off.
- Automatic valves can be triggered by false alarms; know how to reset them.
Setting up alerts that work
- Test each sensor after installing by touching the contacts with a damp cloth.
- Add a second person to app alerts, such as a partner or neighbour.
- Write down how to turn off the water and share it with anyone who looks after your home.
- Check sensors and batteries every few months.
What to do when an alert goes off?
Turn off the water at the stopcock, switch off electrics near the leak if safe to do so, mop up, and find the source. Take photos for your insurer, and call a plumber if you can't fix it. Tell neighbours below if you live in a flat.
Security and privacy
Choose reputable brands that provide security updates. UK product security law (the PSTI regime, in force since April 2024) bans universal default passwords on connectable products. Use a strong, unique password for the app and enable two-step verification.
Low-tech alternatives
- know where your stopcock is and check it turns;
- check under sinks and around appliances monthly;
- watch your water meter overnight: if it moves with no water used, you may have a leak;
- replace old washing machine hoses.
Frequently asked questions
How much do they cost?
Spot sensors are cheap; flow monitors and shut-off valves cost much more, plus installation.
Do I need a smart home hub?
Not for Wi-Fi sensors. Hub-based systems need one.
Sources and further reading
Facts checked on 20 October 2026. Spotted an error? Tell us and we will correct it.