Water Leak Sensors · Head to head

Eufy Water and Freeze Sensor vs Third Reality Water Leak Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Eufy and Third Reality sites.
2026 verdict
For a loud alarm and a wider set of hubs, the Third Reality Water Leak Sensor is the better buy over the Eufy Water and Freeze Sensor.
Third Reality Water Leak Sensor
Winner
Third Reality Water Leak Sensor
$20.99

Last recorded price

Buy on Amazon USA
Its 120 dB siren carries through the house, it pairs fast with Home Assistant and Hubitat, it lasts about three years on AAA cells and it costs less. The Eufy Water and Freeze Sensor answers with a higher owner rating, a temperature sensor with freeze alerts and an IP65 housing, but it needs a Eufy HomeBase and its alarm comes from that base. Pick the Third Reality for a loud, open Zigbee sensor, and the Eufy if you already own a HomeBase and want freeze alerts.
vs
Winner
Third Reality Water Leak Sensor
Third Reality

Third Reality Water Leak Sensor

Prime exclusive deal
$20.99
50% above its lowest price of the last 6 months ($13.99)
7% above its lowest price of the last 6 months (€13.99)

Last recorded price

Buy on Amazon USA

Also sold in packs

  • Pack of 2$39.99$20.00 per unitBuy
  • Pack of 4$79.99$20.00 per unitBuy
Deals by email

Water Leak Sensor prices change while you decide

We follow prices across the catalog and email you the best deals we find.

Smart home deals and news, straight to your inbox

Price drops, new releases and the smart home news worth knowing.

No spam. Unsubscribe in one click.

Your subscription could not be saved. Please try again.
Please enter a valid email address.
Tick the box above to finish signing up.
We couldn't verify you're human. Please try again.
Too many attempts. Please try again in an hour.
Your subscription has been successful.
FeatureEufy Water and Freeze SensorThird Reality Water Leak SensorWinner
Price$34.99$20.99Third Reality Water Leak Sensor
Rating4.54.1Eufy Water and Freeze Sensor
Battery Life2 years3 yearsThird Reality Water Leak Sensor
IntegrationsHome AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home AssistantThird Reality Water Leak Sensor
SensorsWater Leak, TemperatureWater LeakEufy Water and Freeze Sensor
AlertsWater Leak Alerts, Freeze Temperature AlertsWater Leak Alerts, Low Battery AlertsEufy Water and Freeze Sensor
On Device Alert SoundNOYESThird Reality Water Leak Sensor
Warranty1 year1 yearTie
Connectivity2.4 GHz WiFiZigbeeTie
On Device Alert LightNONOTie

What the differences mean

Hub

The Eufy Water and Freeze Sensor needs a Eufy HomeBase (2, 3, S380 or S280). The Third Reality needs a Zigbee hub such as Home Assistant or Hubitat, plus the Smart Bridge MZ1 for Google Home or Apple Home.

Sensors and alerts

The Eufy adds a temperature sensor and freeze alerts. The Third Reality detects water only, with low-battery alerts but no temperature or freeze sensing, so it will not warn about pipes at risk of bursting.

Alarm

The Third Reality has a 120 dB siren that owners hear from other rooms. The Eufy has no sounder of its own, and the HomeBase alarm it uses shares the same loud tone as Eufy's cameras.

Battery

The Third Reality is rated for about three years on two AAA cells. The Eufy runs about two years on a CR123 cell that ships with a thin wrapper to peel off.

Ecosystems

The Third Reality reaches SmartThings and Home Assistant directly, and Google Home and Apple HomeKit through the Smart Bridge MZ1. The Eufy works inside the Eufy app and reaches Home Assistant only through a community integration.

Price

The Third Reality is the cheaper of the pair, which is why owners deploy it across many rooms. The Eufy costs more and only pays off inside a Eufy household.

Which one to buy if

Eufy

Eufy Water and Freeze Sensor

Prime exclusive deal
$34.99

Last recorded price

Buy on Amazon USA
  • + Rating: 4.5
  • + Sensors: Water Leak, Temperature
  • + Alerts: Water Leak Alerts, Freeze Temperature Alerts
  • - Price: $34.99 vs $20.99
  • - Battery Life: 2 years vs 3 years
Winner
Third Reality

Third Reality Water Leak Sensor

Prime exclusive deal
$20.99

Last recorded price

Buy on Amazon USA
  • + Price: $20.99
  • + Battery Life: 3 years
  • + Integrations: Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant
  • - Rating: 4.1 vs 4.5
  • - Sensors: Water Leak vs Water Leak, Temperature

What owners say

Owners of both sensors describe a leak caught early and a setup done in minutes, and each group defends a different strength. Third Reality Water Leak Sensor owners keep returning to the 120 dB alarm, loud enough to hear from another floor and to work without a smart home connection, to fast pairing with Home Assistant and Hubitat and to a price that makes a dozen units practical; their complaints are the raised sensing screws that need spacers for shallow water, the extra Smart Bridge MZ1 for Google Home or Apple HomeKit, and the odd unit that drains its battery or drops offline after a year. Eufy Water and Freeze Sensor owners praise detection sensitive enough to fire on a few drops, simple QR pairing and an optional HomeBase alarm, while warning that the alarm shares the loud camera tone and that some units fail to pair.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Eufy Water and Freeze Sensor
  • Third Reality Water Leak Sensor

Loading price history...

Frequently Asked Questions

Which is better overall: Eufy Water and Freeze Sensor or Third Reality Water Leak Sensor?

The Third Reality Water Leak Sensor for an open Zigbee household, on its 120 dB siren, wide hub support and lower price. The Eufy Water and Freeze Sensor is the better fit inside a Eufy home that wants freeze alerts and can use its HomeBase.

What is the biggest difference between the Eufy Water and Freeze Sensor and the Third Reality Water Leak Sensor?

The hub and the alarm. The Eufy Water and Freeze Sensor needs a Eufy HomeBase and relies on it for sound, while the Third Reality Water Leak Sensor pairs with a Zigbee hub and carries a loud 120 dB siren of its own.

Does the Eufy Water and Freeze Sensor need a HomeBase?

Yes. It connects to a Eufy HomeBase (2, 3, S380 or S280) over a sub-1G link and cannot function without one.

Does the Third Reality Water Leak Sensor work with Google Home directly?

It reaches Google Home and Apple HomeKit through Third Reality's separate Smart Bridge MZ1, and works directly with SmartThings and Home Assistant.

Do both detect freezing pipes?

Only the Eufy Water and Freeze Sensor. It includes a temperature sensor with freeze alerts, while the Third Reality Water Leak Sensor is dedicated to water detection.

Who should buy the Eufy Water and Freeze Sensor?

An existing Eufy Security household that wants sensitive leak and freeze detection with an optional alarm from its HomeBase.

Who should buy the Third Reality Water Leak Sensor?

Home Assistant, Hubitat and Zigbee2MQTT users who want a loud local alarm, fast pairing and an affordable sensor they can deploy in several places.

Full comparison table

Compare all 34 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.

  • 34 Water Leak Sensors
  • 36 specs compared
  • 33 filters
Open the full comparison
More Water Leak Sensors

Top Water Leak Sensors to compare next

34 water leak sensors from 22 brands compared: Aqara, Aeotec, Shelly, Govee and more. Probe types, battery life, alarm volume and protocols.

All Water Leak Sensors
Eufy

More Eufy products

A sharper look at other Eufy products worth comparing.

Explore Eufy
Third Reality

More Third Reality products

A sharper look at other Third Reality products worth comparing.

Explore Third Reality
Price alert

Get an email when the price drops

How much should it drop?

Cancel anytime from the email.

Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.
© 2026 Smart Home Compared
Search