Flume 2 Smart Water Monitor vs Shelly Flood (2026)

Updated September 2026

Data from Amazon and official Flume and Shelly sites.

2026 verdict

Point detection versus whole-home flow is the real fork.

Winner

Shelly Flood

$24.99

Buy on Amazon USA

The Shelly Flood is the better water leak sensor of this pair: cheaper, with temperature and freeze alerts, and native Google Home, Alexa, SmartThings, and Home Assistant over hub-free Wi-Fi. The Flume 2 Smart Water Monitor is better reviewed and weather-resistant, and it adds extra radio paths for a meter-level view of household water use that a puck cannot match. Neither has a local siren. Choose the Shelly Flood to watch a sink, washer, or water heater; choose the Flume 2 Smart Water Monitor when the goal is whole-home leak and usage monitoring.

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Feature	Flume 2 Smart Water Monitor	Shelly Flood	Winner
Price	$199.00	$24.99	Shelly Flood
Rating	4.0	3.8	Flume 2 Smart Water Monitor
Weather Resistance	YES	NO	Flume 2 Smart Water Monitor
Connectivity	2.4 GHz WiFi, Other	2.4 GHz WiFi	Flume 2 Smart Water Monitor
Integrations	Google Home, Alexa, Home Assistant	Google Home, Alexa, 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	Shelly Flood
On Device Alert Sound	NO	NO	Tie
On Device Alert Light	NO	NO	Tie

Flume

Flume 2 Smart Water Monitor

$199.00

Buy on Amazon USA

+ Rating: 4.0
+ Weather Resistance: YES
+ Connectivity: 2.4 GHz WiFi, Other
- Price: $199.00 vs $24.99
- Integrations: Google Home, Alexa, Home Assistant vs Google Home, Alexa, Samsung SmartThings, Home Assistant

Winner

Shelly

Shelly Flood

$24.99

Buy on Amazon USA

+ Price: $24.99
+ Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant
+ Sensors: Water Leak, Temperature
- Rating: 3.8 vs 4.0
- Weather Resistance: NO vs YES

Frequently Asked Questions

Which is better overall, the Flume 2 Smart Water Monitor or the Shelly Flood?

The Shelly Flood wins as a water leak sensor on price, temperature and freeze alerts, and broader integrations including SmartThings. The Flume 2 Smart Water Monitor wins if you want whole-home flow monitoring rather than a spot puck.

What is the biggest difference between these two?

The Shelly Flood is a Wi-Fi puck you place where water might pool. The Flume 2 Smart Water Monitor is a weather-resistant meter-level monitor that tracks household usage and leaks from the supply line.

Which one detects freeze risk?

The Shelly Flood includes a temperature sensor with temperature and freeze alerts. The Flume 2 Smart Water Monitor does not list temperature sensing.

Do they both use Wi-Fi?

Yes. Both the Shelly Flood and the Flume 2 Smart Water Monitor use 2.4 GHz Wi-Fi. Flume also lists an extra radio path. Neither requires a Zigbee or Z-Wave hub.

Who should buy the Shelly Flood?

People who want an affordable hub-free Wi-Fi leak puck with freeze alerts and native Google Home, Alexa, SmartThings, and Home Assistant.

Who should buy the Flume 2 Smart Water Monitor?

Households that care about whole-home water usage and leak monitoring at the meter, not just a single appliance.

Full comparison table

Compare all 32 Water Leak Sensors side by side

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