Updated November 2026
Data from the official Flume and YoLink sites.
2026 verdict
These two solve water problems in different ways, and the YoLink Water Leak Sensor 4 is the more direct leak alarm of the pair.
It is cheaper, better reviewed and covers more sensing ground, adding temperature and freeze alerts, a 105 dB siren and an alert light to a 2x AAA battery rated for about five years. The Flume 2 Smart Water Monitor is the only device here that straps to your water meter and reads whole-house flow, catching leaks that never reach a floor and doubling as a usage monitor, and it reaches Google Home and Home Assistant. That breadth costs more and runs on a proprietary battery. Pick the YoLink Water Leak Sensor 4 for point protection with a loud local siren, and the Flume 2 Smart Water Monitor if you want to see every drop the whole property uses.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
Works with
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Flume 2 Smart Water Monitor | YoLink Water Leak Sensor 4 | Winner |
|---|---|---|---|
| Rating | 4.0 | 4.8 | YoLink Water Leak Sensor 4 |
| Connectivity | 2.4 GHz WiFi, Other | Other | Flume 2 Smart Water Monitor |
| Integrations | Google Home, Home Assistant | Home Assistant | Flume 2 Smart Water Monitor |
| Sensors | Water Leak | Water Leak, Temperature | YoLink Water Leak Sensor 4 |
| Alerts | Water Leak Alerts, Low Battery Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | YoLink Water Leak Sensor 4 |
| On Device Alert Sound | NO | YES | YoLink Water Leak Sensor 4 |
| On Device Alert Light | NO | YES | YoLink Water Leak Sensor 4 |
| Weather Resistance | YES | IP66 | Tie |
What the differences mean
What it watches
The Flume 2 Smart Water Monitor reads the whole house through the water meter, so it catches a buried irrigation leak or a seeping toilet that never touches a floor sensor. The YoLink Water Leak Sensor 4 watches one spot, but it also reads temperature and can warn before a pipe freezes.
Local alarm
The YoLink Water Leak Sensor 4 has a 105 dB siren and an alert light that fire at the device, working even if the hub is offline. The Flume 2 Smart Water Monitor has no siren or light, so every alert reaches you only through the app.
Hub and radio
The YoLink Water Leak Sensor 4 connects over YoLink's proprietary LoRa radio and needs a YoLink hub, which is what gives it range across outbuildings. The Flume 2 Smart Water Monitor uses its own long-range radio to an indoor bridge, and only the bridge joins Wi-Fi.
Battery
The YoLink Water Leak Sensor 4 runs about five years on two common AAA cells, an easy and cheap swap. The Flume 2 Smart Water Monitor's meter sensor uses a proprietary battery pack, which is the single most common long-term complaint owners raise.
Alerts and data
The Flume 2 Smart Water Monitor adds real-time usage, per-minute history and water budgets that go well beyond leak alerts. The YoLink Water Leak Sensor 4 focuses on the leak itself, with freeze and low-battery alerts but no usage analytics.
Which one to buy if
- you want a loud alarm at the point of the leak
The YoLink Water Leak Sensor 4 sounds a 105 dB siren locally, even when the hub is unavailable.
- you want to catch leaks that never reach a floor
The Flume 2 Smart Water Monitor reads the meter, so it sees a hidden irrigation break or a toilet that seeps into the bowl.
- you want to track and reduce your water use
The Flume 2 Smart Water Monitor reports per-minute usage and budgets, which the YoLink sensor does not.
- you want freeze warnings near exposed pipes
The YoLink Water Leak Sensor 4 reports low temperatures and freeze risk, while the Flume has no temperature sensing.
- you want to cover a large property with many inexpensive sensors
The YoLink Water Leak Sensor 4 is the cheaper unit, its LoRa range crosses large distances and its AAA cells are easy to replace.
- + Connectivity: 2.4 GHz WiFi, Other
- + Integrations: Google Home, Home Assistant
- - Rating: 4.0 vs 4.8
- - Sensors: Water Leak vs Water Leak, Temperature
Winner
27% OFF
$17.59
$23.99
- + Rating: 4.8
- + Sensors: Water Leak, Temperature
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- - Connectivity: Other vs 2.4 GHz WiFi, Other
- - Integrations: Home Assistant vs Google Home, Home Assistant
What owners say
Owners of both devices write about saves rather than specs, but the saves look completely different. YoLink Water Leak Sensor 4 owners describe catching a failing water heater or a burst washing machine hose, and they single out the 105 dB siren that fires even if the hub or Wi-Fi is down, plus roughly five years on ordinary AAA batteries. Flume 2 Smart Water Monitor owners talk about a toilet flapper or an irrigation break that no floor sensor could have seen, and about reviewing any minute of the past in the app, while their chief gripe is the move to a proprietary replacement battery and per-fixture attribution that reads as less precise than advertised.
Frequently Asked Questions
Which is better, the Flume 2 Smart Water Monitor or the YoLink Water Leak Sensor 4?
They answer different questions. The YoLink Water Leak Sensor 4 is the better point leak alarm, cheaper and better reviewed with a 105 dB siren, freeze alerts and a long battery life. The Flume 2 Smart Water Monitor is the better whole-house monitor, catching leaks anywhere in the property and charting your usage.
What is the biggest difference between the Flume 2 Smart Water Monitor and the YoLink Water Leak Sensor 4?
Where they watch. The Flume 2 Smart Water Monitor straps to the water meter and reads every drop the house uses, while the YoLink Water Leak Sensor 4 sits at one spot, detects water and low temperatures there and sounds a local siren.
Does the YoLink Water Leak Sensor 4 need a hub?
Yes. The YoLink Water Leak Sensor 4 connects over YoLink's LoRa radio and requires a YoLink hub to relay alerts, but its 105 dB siren and light still work locally if the hub goes down.
Does the Flume 2 Smart Water Monitor work with Home Assistant?
Yes. The Flume 2 Smart Water Monitor works with Google Home and Home Assistant, though it has no Apple Home, SmartThings or Matter support.
Who should buy the YoLink Water Leak Sensor 4?
Someone who wants dependable point protection, a loud siren that survives a network outage, freeze warnings and a long battery life, especially across a large property with a detached garage or outbuilding.
Spotted something wrong on this page? Tell us and we will fix it.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
Compare all 34 Water Leak Sensors side by side
You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 34 Water Leak Sensors
- 37 specs compared
- 34 filters
- Water Leak Sensors
Water Leak Sensor 1
- Water Leak Sensors
Tapo T300
- Water Leak Sensors
Water Guard
- Water Leak Sensors
Wi-Fi Water Leak Detector
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Water and Freeze Sensor
- Water Leak Sensors
Zigbee Water Leak Sensor
- Water Leak Sensors
Flood S Gen4
- Water Leak Sensors
Water Leak Detector 2
- Water Leak Sensors
Water Leak Detector
- Water Leak Sensors
Water Leak Sensor T1
- Water Leak Sensors
Water Leak Detector (Sensor Cable Edition)
- Water Leak Sensors
Flood Sensor (Z-Wave)
- Water Leak Sensors
Flood & Freeze Sensor E20
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Water Sensor Alarm
- Water Leak Sensors
Smart Water Leakage Sensor
- Water Leak Sensors
Flood Sensor (HomeKit)
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Flood Gen4
- Cameras
Uno
- Door & Window Sensors
LoRa Smart Outdoor Contact Sensor
- Door & Window Sensors
Solar Outdoor Door Sensor
- Hubs
Hub
- Motion Sensors
Indoor Motion Sensor RT
- Motion Sensors
LoRa 1/4 Mile Motion Sensor
- Plugs
Mini Plug
- Plugs
Smart Outdoor Energy Plug
- Smoke & CO Detectors
Photoelectric Smoke Alarm
- Temperature & Humidity Sensors
Smart Wireless Thermometer Hygrometer
- Water Leak Sensors
Water Leak Sensor 1
- Water Shutoff Valves
FlowSmart All-in-One Water Meter & Shutoff
- Water Shutoff Valves
Valve Controller 2 with EVO Valve Operator
- Water Timers
Smart Sprinkler Timer