Flume 2 Smart Water Monitor vs Shelly Flood Gen4 comparison

Updated August 2026

Data from Amazon and official Flume and Shelly sites.

2026 verdict

Shelly Flood Gen4 wins the 2026 matchup against Flume 2 Smart Water Monitor, mainly on price, rating, and connectivity. The main reason it wins is price, rating, and connectivity, and integrations and sensors strengthen that case. Flume 2 Smart Water Monitor remains a niche alternative if its specific feature mix matters more than the rest of the comparison. For the average buyer, Shelly Flood Gen4 is the safer choice.

Feature	Flume 2 Smart Water Monitor	Shelly Flood Gen4	Winner
Price	$199.00	$39.99	Shelly Flood Gen4
Rating	4.0	4.2	Shelly Flood Gen4
Connectivity	2.4 GHz WiFi, Other	2.4 GHz WiFi, Bluetooth, Zigbee	Shelly Flood Gen4
Integrations	Google Home, Alexa, Home Assistant	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Shelly Flood Gen4
Sensors	Water Leak	Water Leak, Temperature	Shelly Flood Gen4
Alerts	Water Leak Alerts, Low Battery Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Shelly Flood Gen4
On Device Alert Sound	NO	YES	Shelly Flood Gen4
On Device Alert Light	NO	YES	Shelly Flood Gen4
Weather Resistance	YES	IP44	Tie

Flume

Flume 2 Smart Water Monitor

$199.00

Buy on Amazon USA

- Price: $199.00 vs $39.99
- Rating: 4.0 vs 4.2

Winner

Shelly

Shelly Flood Gen4

$39.99

Buy on Amazon USA

+ Price: $39.99
+ Rating: 4.2
+ Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee

Frequently Asked Questions

Which is better overall: Flume 2 Smart Water Monitor or Shelly Flood Gen4?

Shelly Flood Gen4 has the stronger overall profile in this comparison, especially for price, rating, and connectivity.

What is the biggest difference between Flume 2 Smart Water Monitor and Shelly Flood Gen4?

Price is one of the clearest differences: Flume 2 Smart Water Monitor lists $199.00, while Shelly Flood Gen4 lists $39.99.

Which one looks better on price?

Flume 2 Smart Water Monitor is listed at $199.00, while Shelly Flood Gen4 is listed at $39.99. Shelly Flood Gen4 (better spec).

Who should buy Flume 2 Smart Water Monitor?

Choose Flume 2 Smart Water Monitor if your priority is its specific strengths and that matters more than price.

Who should buy Shelly Flood Gen4?

Choose Shelly Flood Gen4 if your priority is price and rating and that matters more than the competing advantages.

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