Flume 2 Smart Water Monitor vs Third Reality Water Leak Sensor

Updated September 2026

Data from Amazon and official Flume and Third Reality sites.

2026 verdict

A puck under the appliance is a different product from a clamp on the meter.

Winner

Third Reality Water Leak Sensor

$20.99

Buy on Amazon USA

The Third Reality Water Leak Sensor wins this water leak sensor comparison on price, a local alarm sound, and broader hub integrations, SmartThings and Home Assistant natively, plus Google Home, Alexa, and HomeKit through a Third Reality Smart Bridge MZ1. The Flume 2 Smart Water Monitor instead watches whole-home flow over Wi-Fi, with weather resistance and Google Home, Alexa, and Home Assistant, but no on-device siren and no temperature probe. Buy the Third Reality Water Leak Sensor to catch a drip at a known wet spot; buy the Flume 2 Smart Water Monitor to see usage and leaks for the entire house.

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Feature	Flume 2 Smart Water Monitor	Third Reality Water Leak Sensor	Winner
Price	$199.00	$20.99	Third Reality Water Leak Sensor
Weather Resistance	YES	NO	Flume 2 Smart Water Monitor
Connectivity	2.4 GHz WiFi, Other	Zigbee	Flume 2 Smart Water Monitor
Integrations	Google Home, Alexa, Home Assistant	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant	Third Reality Water Leak Sensor
On Device Alert Sound	NO	YES	Third Reality Water Leak Sensor
Rating	4.0	4.0	Tie
Sensors	Water Leak	Water Leak	Tie
Alerts	Water Leak Alerts, Low Battery Alerts	Water Leak Alerts, Low Battery Alerts	Tie
On Device Alert Light	NO	NO	Tie

Flume

Flume 2 Smart Water Monitor

$199.00

Buy on Amazon USA

+ Weather Resistance: YES
+ Connectivity: 2.4 GHz WiFi, Other
- Price: $199.00 vs $20.99
- Integrations: Google Home, Alexa, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant

Winner

Third Reality

Third Reality Water Leak Sensor

$20.99

Buy on Amazon USA

+ Price: $20.99
+ Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant
+ On Device Alert Sound: YES
- Weather Resistance: NO vs YES
- Connectivity: Zigbee vs 2.4 GHz WiFi, Other

Frequently Asked Questions

Which is better overall: the Flume 2 Smart Water Monitor or the Third Reality Water Leak Sensor?

The Third Reality Water Leak Sensor wins overall as a water leak sensor: it is more affordable, has a local siren, and integrates more widely through Zigbee and an optional Smart Bridge MZ1. The Flume 2 Smart Water Monitor is the whole-home water monitor, not a spot detector.

What is the biggest difference between the Flume 2 Smart Water Monitor and the Third Reality Water Leak Sensor?

Where they sit. The Flume 2 Smart Water Monitor clamps at the water meter and reports household flow over Wi-Fi. The Third Reality Water Leak Sensor is a Zigbee puck you place at a sink, washer, or water heater, with a local alarm sound.

Does either one sense temperature or freeze?

No. Neither the Flume 2 Smart Water Monitor nor the Third Reality Water Leak Sensor includes a temperature sensor or freeze alerts.

Which one has a local alarm?

Only the Third Reality Water Leak Sensor has an on-device alert sound. The Flume 2 Smart Water Monitor relies on app and platform alerts.

Who should buy the Third Reality Water Leak Sensor?

Anyone who wants an affordable Zigbee leak puck with a local siren at a specific wet spot, especially on SmartThings or Home Assistant.

Who should buy the Flume 2 Smart Water Monitor?

Households that want whole-home leak and usage monitoring at the meter, with Wi-Fi plus Google Home, Alexa, and Home Assistant.

Full comparison table

Compare all 32 Water Leak Sensors side by side

You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.