What Tuya water sensors do well
Tuya and Smart Life water sensors are cheap and quick to set up. Here's what speaks for them:
- Low price: Many models cost €10–20. Covering several spots in the house stays affordable.
- No hub for WiFi models: The sensor connects straight to WiFi (usually 2.4 GHz only). Zigbee versions, by contrast, need a gateway.
- One app for many brands: Devices from different manufacturers run in the same Tuya or Smart Life app, automations included – closing a smart water valve as soon as water is detected, for example.
- Battery-powered: The sensors sleep most of the time and only wake up on an event. How long the batteries last depends heavily on the model; WiFi models often use AAA batteries, Zigbee models frequently a coin cell.
- Often with a buzzer and sensor cable: Many models also beep on site, and some have an external probe on a cable.
- Voice assistants: Many devices can be linked to Alexa or Google Home.
Why they fall short in a pump sump
A WiFi water sensor reports water that's already there – and to do that it needs a working chain of router, internet and cloud. In a basement with a pump sump, that becomes a problem:
- Only at floor level: The sensor triggers when its contacts get wet. If the pit overflows, the water is already on the basement floor by then.
- No level, no trend: Wet or dry – that's all the sensor knows. How high the water stands in the pit and how fast it's rising stays hidden.
- Pump failure goes unnoticed: The sensor can't tell whether the pump starts or how often it runs.
- No router, no alert: The sensor runs on batteries, but the notification travels over your WiFi and the Tuya cloud to your phone. In a power cut the router is dead – and the warning never arrives. With Zigbee models, the same goes for the gateway. A buzzer on the device only helps if someone hears it.
- Sleeping sensor: To make the batteries last, the sensor sleeps almost all the time and only connects at intervals or when it alarms. You can't continuously see whether it still works. The offline notification has to be switched on per device in the app – and for low-power devices, according to Tuya, it only arrives after more than eight hours.
- Cloud-dependent: Battery-powered WiFi sensors can't be polled locally. Even Home Assistant then gets the data through Tuya's servers. Local operation works better with Zigbee models on your own Zigbee stick.
Feature comparison
| Feature | Drainbee | Tuya |
|---|---|---|
| Continuous water level measurement | ||
| Alert on water at floor level | ||
| Submersible probe for pump sumps | ||
| Power outage alert | ||
| Pump cycles and inflow in the app | ||
| Alert at an adjustable threshold | ||
| No hub required | ||
| No battery changes | ||
| Reading available locally on the home network |
When do you need which?
A Tuya water sensor is enough if …
- You want to detect water at the washing machine, dishwasher, water heater or sink
- You want to cover several spots cheaply
- You already use Tuya or Smart Life devices
- Your basement has no pump sump and no lifting station
Drainbee fits if …
- Your basement has a pump sump, a drainage pit or a lifting station
- You want to see the level in the pit before anything overflows
- You want to know how often the pump runs and how much water flows in when it rains
- You want a warning even when the power or WiFi goes out
- You want to read the level locally on your home network, with Home Assistant for example
Or both: Cheap WiFi water sensors at the washing machine and water heater, Drainbee in the pit. Both work independently of each other.
Verdict
Tuya and Smart Life water sensors are cheap, capable floor detectors. For around €10–20 you get a notification on your phone when water escapes at the washing machine.
They're not enough for a pump sump. They report wet floors, know no level, and need router, internet and cloud to reach you – and in a power cut both are gone. Drainbee measures the water level in the pit, shows pump cycles and inflow, and also reports power and WiFi outages.
They're not enough for a pump sump. They report wet floors, know no level, and need router, internet and cloud to reach you – and in a power cut both are gone. Drainbee measures the water level in the pit, shows pump cycles and inflow, and also reports power and WiFi outages.
Frequently asked questions
Is a Tuya water sensor any good for a basement?
For water on the basement floor, yes – at the washing machine, water heater or boiler, for example. But if your basement has a pump sump or a lifting station, the sensor only reports once the pit has already overflowed. It doesn't measure the level in the pit.
Does a Smart Life water sensor work during a power outage?
The sensor itself runs on batteries. But it sends its notification over your WiFi and the Tuya cloud – and the router is dead in a power cut. The warning then never reaches your phone; a buzzer on the device only helps if someone is nearby. Drainbee has no battery: if power or WiFi drops out, the device stops reporting. The Drainbee cloud notices and warns you in the app.
Can I integrate a Tuya water sensor locally in Home Assistant?
Not a WiFi model. Battery-powered WiFi sensors sleep almost all the time and only connect on an event. The developers of the local Tuya integration for Home Assistant therefore point out that such devices can't be supported locally – the data comes through the Tuya cloud. Zigbee models, by contrast, can run locally on your own Zigbee stick with ZHA or Zigbee2MQTT. Drainbee provides the level on your home network through a local, read-only JSON interface that Home Assistant, ioBroker or Node-RED can poll directly.
Can I put a WiFi water sensor into the pump sump?
It isn't built for that. The sensor only distinguishes wet from dry and is meant for water on the floor; the housings aren't designed for permanent use in a pit. Drainbee uses a submersible probe to measure how high the water stands (0–1 m, ±1 cm) and warns you as soon as your threshold is reached.
Why does Drainbee cost €298 and a Tuya water sensor only €15?
Because they do different things. The Tuya sensor detects water on the floor. Drainbee measures the level in the pit every 10 seconds to 5 minutes, shows pump cycles, inflow and rain history, and reports power outages and WiFi loss. The price is one-off, with no subscription.
Can I combine both?
Yes. WiFi water sensors at the washing machine and water heater, Drainbee in the pump sump. Both work independently, and each system warns you through its own channel.
Sources
- Tuya: Water Leak Detector – Solution (2026) (opens in a new tab)
- Tuya Developer: Wireless Zigbee Gateway (2026) (opens in a new tab)
- Tuya Developer: Device Offline Notification – Smart App SDK (2026) (opens in a new tab)
- tuya-local: Home Assistant integration – README (2026) (opens in a new tab)
- Zigbee2MQTT: Tuya TS0207 water leak detector (2026) (opens in a new tab)