The highest-value automation in any home is a water leak sensor connected to a shut-off valve. A leak detected while nobody is home does no damage if the valve closes within seconds. The same leak discovered hours later damages your flooring, your possessions and frequently the flat below.
Water leak detection
A leak sensor is a small battery device placed where water would appear first. On its own it sends an alert. Paired with a motorised valve, it closes the supply automatically — which is the part that actually prevents damage, because alerts only help if someone is available to act on them.
Where to place sensors
- Under the kitchen sink, at the lowest point.
- Behind the washing machine — hoses are a common failure point.
- Under the water heater.
- In the bathroom near the toilet supply.
- Beside any water tank or pump.
For runs rather than points, a leak sensor cable detects water anywhere along its length. Under a machine or along a pipe run this is considerably more reliable than hoping a puddle reaches one small sensor.
Gas detection
LPG cylinders are common in Egyptian kitchens, and LPG is heavier than air — it pools at floor level rather than rising.
That single fact determines placement: mount an LPG detector low, near the floor. A detector mounted at head height, where people instinctively put them, may not detect a leak until it is severe.
Natural gas is lighter than air and detectors for it mount high. Check which supply you have before positioning.
Smoke and heat
Smoke alarms belong on ceilings, away from kitchens where cooking causes false alarms. In a kitchen, a heat alarm is the correct device — it responds to temperature rise rather than particles, so frying does not set it off.
A connected alarm adds one important capability: it tells you about a fire in a property you are not in. For a second home, a rental or a shop, that is the whole point.
Building a useful safety setup
Sensors that only notify are half a system. The value comes from pairing detection with action:
- Leak sensor closes the water valve.
- Gas detector cuts power to the kitchen circuit and triggers an alert.
- Any alarm turns on all lights, which matters at night.
Test the automation after installing it — trigger the sensor deliberately and confirm the valve actually closes. An untested safety automation is an assumption, not a protection.
Batteries
Battery devices report their level in the app. Set a reminder to check them, because a leak sensor with a flat cell is worse than none: it creates a false sense of protection.
See Safety & Security Sensors and Smart Controllers.
Frequently asked questions
Will the valve close if the internet is down?
With a local automation, yes. Confirm the rule runs on the device or hub rather than in the cloud.
How long do sensor batteries last?
Zigbee and Bluetooth sensors typically a year or more; Wi-Fi sensors considerably less.
Where exactly should a gas detector go?
Low for LPG, high for natural gas, and within a couple of metres of the appliance.