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Third Reality Water Leak Sensor

ThirdReality

budget local: excellentFully controllable on your LAN with no internet dependency. Zigbee
Price
$20.99 verified Sep 13, 2026
HA fit
good
Works offline
yes
Setup
easy
Hub needed
yes
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Third Reality Zigbee water leak sensor

Quick verdict

Cheap, simple, and it works - that's all you really need from a water leak sensor. Scatter a few under sinks, behind the washing machine, and near the water heater. Zigbee means it runs fully local through Home Assistant with no cloud or subscription.

Standout: Cheap and reliable Zigbee water leak detection - scatter several around your home to catch leaks early.

Notes last checked May 31, 2026.

Compatibility snapshot

Home Assistant goodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple Home noneNo official support on this platform.
Google Home noneNo official support on this platform.
Alexa okayWorks, but with limits or extra setup.
Works offline yes
Setup easy
Extra hub needed yes
Power battery

Local control facts

  • Home Assistant: zha integration, Local Polling (home-assistant.io, checked Sep 10, 2026)

Why it stands out

  • very affordable water leak detection
  • solid Zigbee compatibility with zigbee2mqtt and ZHA
  • long battery life on 2x AAA batteries

Reasons to hesitate

  • basic feature set - detection only, no water shutoff valve control
  • requires a Zigbee coordinator for Home Assistant use

Best for

  • budget water leak monitoring under sinks, water heaters, and washing machines
  • Zigbee Home Assistant setups needing reliable leak alerts

Avoid if

  • you want an all-in-one leak detection plus automatic shutoff system
  • you have no Zigbee coordinator

Privacy and local-control notes

Pure Zigbee sensor with no cloud dependency. Fully local operation through zigbee2mqtt or ZHA.

Home Assistant support: supported · integration path: zigbee2mqtt / ZHA.

Buying reality check

Price notes: Very budget-friendly. Buy multiples to cover every leak-prone spot.

Verified price reads: lowest seen $20.99, latest $20.99 on Sep 13, 2026.

  • Sep 13, 2026$20.99amazon
  • Sep 4, 2026$20.99amazon

Compare side by side: see sensor comparisons →

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