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  • Meross Smart Water Leak Sensor
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  • Smart Water Leak Sensor
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  • Smart Water Leak Sensor
  • Smart Water Leak Sensor
  • Smart Water Leak Sensor
  • Smart Water Leak Sensor

Meross Smart Water Leak Sensor

3.6
42 ratings
Launch Year: 2022

Model: MS400H

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Our review

Meross Smart Water Leak Sensor Review: Strong HomeKit Support Undercut by Hub Reliability

Easy Apple HomeKit and Home Assistant pairing and a compact, waterproof design, but recurring complaints about the hub dropping offline temper the appeal.

The verdict

The Meross Smart Water Leak Sensor is a compact, HomeKit-friendly detector that pairs quickly with Meross's Smart Wi-Fi Hub and works well as part of an Apple Home or Home Assistant automation setup, several buyers describe smooth setup and genuine leaks caught early. The recurring problem reported across regions is the hub itself losing its connection and needing a manual restart, which silently breaks remote alerts until someone notices, and a handful of buyers also found the on-device alarm too quiet to rely on. It's a reasonable pick for HomeKit or Home Assistant households who will periodically check that the hub is still online, but not the most dependable choice for a completely set-and-forget install.

Best for
  • Apple HomeKit households wanting native integration
  • Home Assistant users needing a compatible leak sensor
  • Buyers who already own a Meross Smart Wi-Fi Hub
  • Multi-sensor setups with existing Meross ecosystem devices

Pros

  • Native Apple HomeKit integration with easy pairing
  • Home Assistant and Samsung SmartThings support
  • Compact, IP67 waterproof design fits tight spots
  • Multiple sensors can share a single hub
  • Automations support for triggering other smart devices

Cons

  • Hub reportedly drops offline periodically, requiring a manual restart
  • On-device alarm (about 60 dB) is quiet compared to rivals
  • No on-device alert light
  • No Google Home or Alexa integration
  • Requires a separately paired Meross Smart Wi-Fi Hub
  • No temperature, tamper, or freeze alerts

Who is the Meross Smart Water Leak Sensor for?

This sensor targets buyers already in, or building, an Apple HomeKit or Home Assistant smart home who want water-leak alerts to show up alongside their other automations rather than in a separate app. Because it depends on the Meross Smart Wi-Fi Hub rather than direct Wi-Fi, it fits naturally into a multi-sensor setup, buyers describe running several sensors, plus other Meross devices like temperature/humidity sensors, off a single hub covering sinks, washing machines and kitchens.

What buyers love

Buyers consistently highlight how smooth pairing is with the hub, using a simple conductive strip to trigger pairing mode, and several call out the seamless HomeKit integration, sensors show up immediately on the Apple Home dashboard and can trigger automations like shutting off a solenoid valve. The compact IP67-rated housing is described as neat and easy to tuck next to a washing machine or under a sink, and multiple buyers on both sides of the Atlantic say the sensor caught a real leak early enough to prevent damage.

What to know before you buy

The most common and most serious complaint is that the Meross hub itself periodically goes offline and needs a manual power cycle to reconnect, several buyers say this happens roughly monthly and defeats the purpose of remote alerts since notifications simply stop arriving until the hub is noticed and restarted, one buyer worked around it by scheduling a smart-outlet power cycle every 12 hours. A smaller number of reviewers found the on-device alarm, rated around 60 dB, too quiet to serve as a reliable audible warning, and there is no on-device alert light to compensate. There is also no Google Home or Alexa support, only Apple HomeKit and Samsung SmartThings, and no temperature, tamper or freeze alerts, this is a water-detection-only sensor.

Is the Meross Smart Water Leak Sensor worth it?

At a budget-friendly price, the HomeKit and Home Assistant integration and compact design make this an appealing pick for the right household, but the recurring hub-connectivity complaints mean it works best for buyers willing to periodically confirm the hub is still online rather than trusting it completely unattended. Buyers who want Alexa or Google Home support, or a louder standalone alarm, should look elsewhere in the category.

Frequently asked questions

Does the Meross Smart Water Leak Sensor work with Alexa or Google Home?

No. It supports Apple HomeKit, Samsung SmartThings and Home Assistant, but has no Alexa or Google Home integration.

Do I need a hub to use this sensor?

Yes. It connects to a Meross Smart Wi-Fi Hub over Sub-1GHz wireless rather than directly to Wi-Fi, and the hub connects to your network over 2.4GHz Wi-Fi.

Is the alarm loud enough to hear?

The on-device alarm is rated around 60 dB. Some buyers found it quieter than they expected for an urgent alert, so app notifications are the more reliable warning.

How reliable is the connection to the hub?

Buyer reports are mixed. Many describe reliable operation, but a recurring complaint is the hub periodically losing its connection and needing a manual restart to resume sending alerts.

Is the Meross Smart Water Leak Sensor waterproof?

Yes, it carries an IP67 weather-resistance rating, suitable for placement under sinks, near water heaters or by washing machines.

At a glance

Summary

Everything this water leak sensor supports, grouped by category.

Size & Materials
Weather Resistance (IP67)2.8 × 2.8 × 1.6 in (71.5 × 71.5 × 41.5 mm)3.8 oz (108 g)
Integrations
Apple HomeKitSamsung SmartThingsHome Assistant
Sensors
Water Leak
Alerts
Water Leak Alerts
Features
On Device Alert Sound

Price History

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Company
Meross logo

Meross

4.3/ 5 avg ratingChina flagHeadquartered in China

Meross is a smart home brand offering affordable connected devices such as smart plugs, switches, garage door openers, LED lighting and sensors. Many Meross products support Apple HomeKit alongside Alexa and Google Home, making them a budget-friendly option for HomeKit users. The brand is popular for adding smart control to everyday home fixtures.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials

Weather Resistance

IP67

Dimensions

2.8 × 2.8 × 1.6 in (71.5 × 71.5 × 41.5 mm)

Weight

3.8 oz (108 g)

Included accessories

Sensor Cable

NO

Power

Wired

NO

Battery Type

CR123A

Battery Life

1.5 years

Connectivity

2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

Sub-1G (Smart Wi-Fi Hub required)

802.11 b/g/n 2.4GHz Wi-Fi (smart hub)/ SubG Wireless technology (between smart hub and alarm).

Integrations

Google Home

NO

Alexa

NO

Apple HomeKit

YES

Samsung SmartThings

YES

Home Assistant

YES

IFTTT

NO

Matter

NO

Sensors

Water Leak

YES

Temperature

NO

Tilt

NO

Alerts

Water Leak Alerts

YES

Temperature Alerts

NO

Freeze Temperature Alerts

NO

Low Battery Alerts

?

Tamper Alerts

NO

Features

On Device Alert Sound

YES

Up to about 60dB when alarming.

On Device Alert Light

NO

Automations

YES

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