Centralite 3-Series Water Sensor vs Flume 2 Smart Water Monitor

Updated September 2026

Data from Amazon and official Centralite and Flume sites.

2026 verdict

Whole-home monitoring, not a puck, is why the Flume 2 Smart Water Monitor wins this water leak sensor comparison.

Winner

Flume 2 Smart Water Monitor

$199.00

Buy on Amazon USA

It is weather-resistant, talks 2.4 GHz Wi-Fi plus an extra radio, and reaches Google Home, Alexa, and Home Assistant. The Centralite 3-Series Water Sensor is the more affordable Zigbee option, with temperature and freeze alerts Flume does not sense, plus SmartThings. Flume has no on-device alarm either. Pick the Flume 2 Smart Water Monitor to watch the whole supply line; pick the Centralite 3-Series Water Sensor to drop a cheap temperature-aware puck on a Zigbee hub.

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Feature	Centralite 3-Series Water Sensor	Flume 2 Smart Water Monitor	Winner
Price	$19.95	$199.00	Centralite 3-Series Water Sensor
Rating	3.8	4.0	Flume 2 Smart Water Monitor
Weather Resistance	NO	YES	Flume 2 Smart Water Monitor
Connectivity	Zigbee	2.4 GHz WiFi, Other	Flume 2 Smart Water Monitor
Integrations	Samsung SmartThings, Home Assistant	Google Home, Alexa, Home Assistant	Flume 2 Smart Water Monitor
Sensors	Water Leak, Temperature	Water Leak	Centralite 3-Series Water Sensor
Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts	Water Leak Alerts, Low Battery Alerts	Centralite 3-Series Water Sensor
On Device Alert Sound	NO	NO	Tie
On Device Alert Light	NO	NO	Tie

Centralite

Centralite 3-Series Water Sensor

$19.95

Buy on Amazon USA

+ Price: $19.95
+ Sensors: Water Leak, Temperature
+ Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- Rating: 3.8 vs 4.0
- Weather Resistance: NO vs YES

Winner

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 $19.95
- Sensors: Water Leak vs Water Leak, Temperature

Frequently Asked Questions

Which is better overall: the Centralite 3-Series Water Sensor or the Flume 2 Smart Water Monitor?

The Flume 2 Smart Water Monitor wins overall on weather resistance, connectivity, and wider voice-assistant support. The Centralite 3-Series Water Sensor is cheaper and is the one that senses temperature and freeze at a specific spot.

What is the biggest difference between the Centralite 3-Series Water Sensor and the Flume 2 Smart Water Monitor?

Spot Zigbee detection versus whole-home Wi-Fi monitoring. The Centralite 3-Series Water Sensor sits on the floor at a wet-risk location. The Flume 2 Smart Water Monitor watches flow at the meter for the entire house.

Which one needs a hub?

The Centralite 3-Series Water Sensor needs a Zigbee hub. The Flume 2 Smart Water Monitor uses 2.4 GHz Wi-Fi and does not need Zigbee or Z-Wave.

Does Flume detect freeze the way Centralite does?

No. The Centralite 3-Series Water Sensor includes temperature and freeze alerts. The Flume 2 Smart Water Monitor does not list a temperature sensor.

Who should buy the Flume 2 Smart Water Monitor?

Households that want whole-home leak and usage monitoring, with Google Home, Alexa, and Home Assistant, rather than a single-location puck.

Who should buy the Centralite 3-Series Water Sensor?

Zigbee SmartThings or Home Assistant users who want an affordable leak puck that also watches temperature and freeze.

Full comparison table

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