Shelly Flood vs Shelly Flood Gen4 comparison

Updated July 2026

Data from Amazon and official Shelly site.

2026 verdict

Two generations of the same water leak sensor line face off here, and the Shelly Flood Gen4 pulls ahead of the Shelly Flood with a higher owner rating, a longer warranty, real weather resistance, a longer battery life, and a wider connectivity and integration list that adds Zigbee, Bluetooth and Matter alongside WiFi. It also picks up an on-device alarm sound and light that the original Shelly Flood never had. The older Shelly Flood still holds one card: a lower price for buyers who just want a basic WiFi sensor without the extra protocols. Choose the Shelly Flood Gen4 for the newer, better-rounded sensor with more ways to connect and alert; stick with the Shelly Flood if price is the deciding factor.

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Feature	Shelly Flood	Shelly Flood Gen4	Winner
Price	$24.99	$39.99	Shelly Flood
Rating	3.8	4.2	Shelly Flood Gen4
Warranty	2 years	3 years	Shelly Flood Gen4
Weather Resistance	NO	IP44	Shelly Flood Gen4
Battery Life	1.5 years	2 years	Shelly Flood Gen4
Connectivity	2.4 GHz WiFi	2.4 GHz WiFi, Bluetooth, Zigbee	Shelly Flood Gen4
Integrations	Google Home, Alexa, Samsung SmartThings, Home Assistant	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Shelly Flood Gen4
On Device Alert Sound	NO	YES	Shelly Flood Gen4
On Device Alert Light	NO	YES	Shelly Flood Gen4
Sensors	Water Leak, Temperature	Water Leak, Temperature	Tie
Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Tie

Shelly

Shelly Flood

$24.99

Buy on Amazon USA

+ Price: $24.99
- Rating: 3.8 vs 4.2
- Warranty: 2 years vs 3 years

Winner

Shelly

Shelly Flood Gen4

$39.99

Buy on Amazon USA

+ Rating: 4.2
+ Warranty: 3 years
+ Weather Resistance: IP44
- Price: $39.99 vs $24.99

Frequently Asked Questions

Which is better overall, the Shelly Flood or the Shelly Flood Gen4?

The Shelly Flood Gen4 wins overall with a higher rating, a longer warranty, weather resistance, a longer battery life, and broader connectivity and integrations. The original Shelly Flood is only cheaper to buy.

What is the biggest difference between the Shelly Flood and the Shelly Flood Gen4?

Protocol support and local alerting. The Shelly Flood Gen4 adds Zigbee, Bluetooth and Matter on top of WiFi, plus a built-in alarm sound and light, none of which the original Shelly Flood has.

Does either generation have a local alarm?

Only the Shelly Flood Gen4. It includes an on-device alert sound and light, while the original Shelly Flood has neither and relies entirely on app or platform notifications.

Which one is cheaper?

The original Shelly Flood is the more affordable of the two, which may matter if you're deploying several units on a tight budget.

Who should buy the Shelly Flood?

Buyers who want the cheapest WiFi-only Shelly leak sensor and don't need Zigbee, Matter or a local alarm.

Who should buy the Shelly Flood Gen4?

Buyers who want the newer, higher-rated sensor with more connectivity options, weather resistance, and a built-in alarm.

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