Winner
25% OFF
$14.95
$19.95
Updated October 2026
Data from the official Centralite and Flume sites.
2026 verdict
The Centralite 3-Series Water Sensor is the lower priced, more feature-complete leak sensor here, and it also reports temperature.
It pairs seamlessly with Samsung SmartThings and Home Assistant, catches leaks and freeze conditions, and is compact enough to tuck into tight spots. The Flume 2 Smart Water Monitor wins on what only a meter reader can do: it watches every drop the whole property uses and catches leaks that never reach a floor, and it is the better reviewed of the two. Choose the Centralite 3-Series Water Sensor for cheap, integrated point protection in a Zigbee home, and the Flume 2 Smart Water Monitor when whole-property coverage is the goal.
Works with
Connectivity
vs
Works with
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Centralite 3-Series Water Sensor | Flume 2 Smart Water Monitor | Winner |
|---|---|---|---|
| Rating | 3.8 | 4.0 | Flume 2 Smart Water Monitor |
| Connectivity | Zigbee | 2.4 GHz WiFi, Other | 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 |
| Integrations | Samsung SmartThings, Home Assistant | Google Home, Home Assistant | Tie |
| On Device Alert Sound | NO | NO | Tie |
| On Device Alert Light | NO | NO | Tie |
What the differences mean
Battery
The Centralite 3-Series Water Sensor is rated three years on a CR2, and several owners still report faster drain. The Flume 2 Smart Water Monitor uses a proprietary battery pack that long-term owners dislike replacing.
What it sees
The Flume 2 Smart Water Monitor reads the whole-house meter and catches leaks anywhere in the property. The Centralite 3-Series Water Sensor senses water only where it sits.
Temperature alerts
The Centralite 3-Series Water Sensor includes water, temperature and freeze alerts. The Flume 2 Smart Water Monitor reports no temperature at all.
Integration
The Centralite 3-Series Water Sensor pairs directly under its own name in Samsung SmartThings and works with Home Assistant. The Flume 2 Smart Water Monitor works with Google Home and Home Assistant, but is not a Zigbee device.
Setup
The Centralite 3-Series Water Sensor is placed and adopted by the hub in minutes. The Flume 2 Smart Water Monitor straps to the meter and needs a mains-powered bridge indoors within range.
Which one to buy if
- your home runs on Samsung SmartThings or Zigbee
The Centralite 3-Series Water Sensor pairs under its own name with SmartThings and works with Home Assistant.
- you want to catch a leak anywhere in the property
The Flume 2 Smart Water Monitor reads the whole-house meter and sees hidden leaks.
- you want temperature and freeze alerts too
The Centralite 3-Series Water Sensor includes temperature and freeze-temperature alerts.
- you want to track water usage
The Flume 2 Smart Water Monitor reports per-minute usage with history and budgets.
- you want the cheaper, easier install
The Centralite 3-Series Water Sensor costs less and needs no meter compatibility check or indoor bridge.
Winner
25% OFF
$14.95
$19.95
- + Sensors: Water Leak, Temperature
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- - Rating: 3.8 vs 4.0
- - Connectivity: Zigbee vs 2.4 GHz WiFi, Other
- + Rating: 4.0
- + Connectivity: 2.4 GHz WiFi, Other
- - Sensors: Water Leak vs Water Leak, Temperature
- - Alerts: Water Leak Alerts, Low Battery Alerts vs Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
What owners say
Owners of both are satisfied with the alert, though the two sensors earn it differently. Centralite 3-Series Water Sensor owners say it pairs with SmartThings almost without effort and fires immediately on water, and several use it as a backup near a sump pump; their warning is battery life, which some find drains far faster than the rated three years and can drop the connection as it fades. Flume 2 Smart Water Monitor owners prize catching a hidden toilet leak and reviewing any minute of past usage, but grumble about the proprietary battery pack and the imprecise per-fixture breakdown.
Frequently Asked Questions
Which is better overall: Centralite 3-Series Water Sensor or Flume 2 Smart Water Monitor?
For an inexpensive, integrated point sensor the Centralite 3-Series Water Sensor wins on price, SmartThings pairing and temperature alerts. The Flume 2 Smart Water Monitor is the choice when you want whole-property leak detection and usage tracking, and it is the better reviewed of the two.
Does the Centralite 3-Series Water Sensor work with SmartThings?
Yes. It pairs directly under the Centralite brand name in the SmartThings app and also works with Home Assistant. The Flume 2 Smart Water Monitor works with Google Home and Home Assistant instead.
Does either sensor warn about freezing?
The Centralite 3-Series Water Sensor does, with temperature and freeze-temperature alerts. The Flume 2 Smart Water Monitor does not measure temperature.
Does the Flume 2 Smart Water Monitor have a battery problem?
Its replacement pack is now a proprietary part, which long-term owners dislike. The Centralite 3-Series Water Sensor uses a standard CR2, though some owners still report faster-than-expected drain.
Can the Centralite 3-Series Water Sensor find a hidden leak?
No. It senses water where it sits. The Flume 2 Smart Water Monitor is the one that catches leaks anywhere in the system from the meter.
Who should buy the Centralite 3-Series Water Sensor?
SmartThings and Home Assistant owners who want a cheap, compact sensor that covers water, temperature and freezing at a point.
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 do not mind the proprietary battery.
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