Updated November 2026
Data from the official Flume and Shelly sites.
2026 verdict
The Shelly Flood is the better deal of these two leak sensors, and the only one that reports temperature as well as water.
It connects straight to 2.4 GHz Wi-Fi with no hub, doubles as a temperature sensor, and works with Google Home, SmartThings and Home Assistant for a fraction of the other's cost. The Flume 2 Smart Water Monitor stands apart in what it can see: strapped to the water meter, it tracks usage across the whole property and catches leaks that never reach a floor. Choose the Shelly Flood for an inexpensive point sensor with temperature reports, and the Flume 2 Smart Water Monitor for whole-property leak and usage monitoring.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
3% OFF
€25.40
€26.09
Works with
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Flume 2 Smart Water Monitor | Shelly Flood | Winner |
|---|---|---|---|
| Rating | 4.0 | 3.8 | Flume 2 Smart Water Monitor |
| Connectivity | 2.4 GHz WiFi, Other | 2.4 GHz WiFi | Flume 2 Smart Water Monitor |
| Integrations | Google Home, Home Assistant | Google Home, Samsung SmartThings, Home Assistant | Shelly Flood |
| Sensors | Water Leak | Water Leak, Temperature | Shelly Flood |
| Alerts | Water Leak Alerts, Low Battery Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | Shelly Flood |
| Local Control | NO | YES | Shelly Flood |
| On Device Alert Sound | NO | NO | Tie |
| On Device Alert Light | NO | NO | Tie |
What the differences mean
Temperature sensing
The Shelly Flood doubles as a temperature sensor with temperature alerts. The Flume 2 Smart Water Monitor does not measure temperature or humidity at all.
What it watches
The Flume 2 Smart Water Monitor reads the meter and sees leaks anywhere in the system, even ones that never reach a floor. The Shelly Flood senses water only where its body sits.
Hub and bridge
The Shelly Flood connects directly to 2.4 GHz Wi-Fi with no hub. The Flume 2 Smart Water Monitor needs an indoor bridge plugged into mains within range of the meter.
Frozen pipes
The Flume 2 Smart Water Monitor measures flow, not temperature, so it will not warn of a freezing pipe. The Shelly Flood tracks temperature and can raise a freeze alert.
Which one to buy if
- you want temperature and freeze reports too
The Shelly Flood doubles as a temperature sensor and raises temperature and freeze alerts.
- you want to catch leaks anywhere in the property
The Flume 2 Smart Water Monitor reads the whole-house meter and sees hidden leaks.
- you want to track water usage
The Flume 2 Smart Water Monitor reports usage per minute with history and budgets.
- you want the cheapest multi-sensor coverage
The Shelly Flood is far less expensive, so the same budget covers more spots.
- your home runs on Home Assistant
The Shelly Flood is picked up automatically by Home Assistant and also reports temperature.
- + Rating: 4.0
- + Connectivity: 2.4 GHz WiFi, Other
- - Integrations: Google Home, Home Assistant vs Google Home, Samsung SmartThings, Home Assistant
- - Sensors: Water Leak vs Water Leak, Temperature
Winner
3% OFF
€25.40
€26.09
- + Integrations: Google Home, Samsung SmartThings, Home Assistant
- + Sensors: Water Leak, Temperature
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- - Rating: 3.8 vs 4.0
- - Connectivity: 2.4 GHz WiFi vs 2.4 GHz WiFi, Other
What owners say
Owners of both appreciate an early warning, and both mention the app experience. Shelly Flood owners like the no-app browser setup and that Home Assistant picks it up automatically with temperature data, and they value how cheaply they can scatter several around the house; their complaints are units dropping off Wi-Fi and the CR123A battery that is not included. Flume 2 Smart Water Monitor owners praise catching a hidden toilet-flapper leak and the per-minute usage history, but are unhappy about the proprietary replacement battery and the imprecise per-fixture attribution.
Frequently Asked Questions
Which is better overall: Flume 2 Smart Water Monitor or Shelly Flood?
They serve different jobs. The Shelly Flood is the cheaper, hub-free point sensor with Wi-Fi, temperature and Home Assistant support, while the Flume 2 Smart Water Monitor watches the whole property from the meter and tracks usage, catching leaks no floor sensor reaches.
Does the Flume 2 Smart Water Monitor detect temperature?
No. It measures water flow only. The Shelly Flood is the one of the two with a temperature sensor and temperature and freeze alerts.
Do either of these have an alarm siren?
No. Both the Shelly Flood and the Flume 2 Smart Water Monitor alert through the app, with no local siren on either device.
Do these sensors need a hub?
The Shelly Flood connects directly to 2.4 GHz Wi-Fi and needs no hub. The Flume 2 Smart Water Monitor needs its indoor bridge, which must sit within range of the meter and on mains power.
Can the Shelly Flood find a leak behind a wall?
No. It senses water at its own body. The Flume 2 Smart Water Monitor is the one that catches leaks anywhere in the system, because it reads total flow at the meter.
Who should buy the Shelly Flood?
Home Assistant, Google Home or SmartThings users who want a cheap, temperature-reporting leak sensor with no-app setup, and who accept its app-only alerting.
Who should buy the Flume 2 Smart Water Monitor?
Owners who want whole-property leak detection and detailed water usage, can confirm meter compatibility, and want to catch leaks a floor sensor would never reach.
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