Image Slideshow Items

  • Heiman Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
  • Smart Water Leakage Sensor
Last updated August 2026

Heiman Smart Water Leakage Sensor

4.4
37 ratings
Launch Year: 2024

Model: HS2WL-R

$19.99
As an Amazon Associate I earn from qualifying purchases
Open selection
Stay in the loop

Smart Home Deals & News straight to your inbox

Join the newsletter and get the best smart home deals and new releases in your inbox.

Your subscription could not be saved. Please try again.
Your subscription has been successful.

Smart Home Deals & News straight to your inbox

Join the newsletter and get the best smart home deals and new releases in your inbox.

Our review

Heiman Smart Water Leakage Sensor Review: A Compact, Reliable Alarm With a Catch on Smart Features

A small, IP67-rated leak puck with a loud local alarm and Wi-Fi and Home Assistant support, but full remote alerts require a separately purchased gateway.

The verdict

The Heiman Smart Water Leakage Sensor is a compact, puck-style detector that reliably sounds a loud local alarm the moment its contacts touch water, making it a solid stand-alone choice for under sinks, water heaters and laundry rooms. Buyers who bought only the single sensor consistently point out that remote app alerts and smart features need Heiman's gateway, which is not bundled with every listing, so it's worth confirming exactly what's included before buying. For anyone who mainly wants a dependable local alarm, with the option to add smart notifications later via the gateway, it's a solid, compact pick.

Best for
  • Buyers who want a simple, stand-alone local water alarm
  • Homeowners already invested in the Heiman ecosystem or a gateway kit
  • Tight spaces like under sinks or behind washing machines
  • Home Assistant users looking for a compatible leak sensor

Pros

  • Loud 75 dB on-device alarm that works even without a gateway
  • Compact, durable, waterproof (IP67) housing fits tight spaces
  • Simple battery swap and easy placement
  • 2.4 GHz Wi-Fi and Home Assistant compatibility
  • Low battery alerts once connected

Cons

  • Full remote/app alerts require a separately purchased gateway
  • No Google Home, Alexa or Apple HomeKit integration
  • Samsung SmartThings support is only partial
  • 2.4 GHz Wi-Fi only, no 5 GHz support
  • No sensor cable included

Who is the Heiman Smart Water Leakage Sensor for?

This sensor suits buyers who want a small, unobtrusive puck placed near common leak points, under a kitchen or bathroom sink, behind a washing machine, next to a water heater, that sounds a loud alarm the instant its two bottom contacts touch water. Several buyers describe placing it after a past water-damage incident where a slow leak went unnoticed until flooring or subfloor was already ruined, using the sensor purely as an early local warning.

What buyers love

The most common praise is for simplicity and reliability as a stand-alone alarm: buyers describe twisting off the cover, dropping in the included battery, and placing the compact 69 mm sensor exactly where they need it, with the alarm reliably sounding the moment it detects water. Several note the plastic housing feels durable and the local alarm, rated at 75 dB, is loud enough to notice even without any app connected. Buyers who did pair it with a gateway also mention the 2.4 GHz Wi-Fi connection and Home Assistant compatibility as useful for folding the sensor into an existing smart home setup.

What to know before you buy

The most repeated complaint is that a single-unit purchase only includes the sensor itself, not the gateway needed for app notifications, remote alerts or other smart features, several buyers say this wasn't made clear in the listing and they were left with a alarm-only device unless they separately invest in the gateway hardware. Samsung SmartThings support is only partial, and the sensor has no Google Home, Alexa or Apple HomeKit integration, and no Matter or IFTTT support either. It also only supports 2.4 GHz Wi-Fi, not 5 GHz, so it needs to sit on the right network band to connect at all.

Is the Heiman Smart Water Leakage Sensor worth it?

At a budget-friendly price for a single sensor, this is a dependable local water alarm first and a smart sensor second, buyers who just want a loud, reliable puck under a sink or appliance get exactly that, while anyone wanting remote phone alerts out of the box should budget for the separate gateway or look for a bundle that includes one. Given the strong buyer sentiment on build quality and detection reliability, it's a fair value once expectations about the gateway are set correctly.

Frequently asked questions

Do I need a gateway to use the Heiman Smart Water Leakage Sensor?

The sensor works stand-alone with its local alarm out of the box, but remote app alerts and smart features require Heiman's gateway. Many single-unit listings do not include the gateway, so check the listing carefully if you want remote notifications.

Does it work with Alexa or Google Home?

No. It has no Alexa, Google Home or Apple HomeKit integration. Samsung SmartThings support is only partial, while Home Assistant is supported.

How loud is the alarm?

The on-device alarm is rated at 75 dB, loud enough for buyers to notice locally even without the app connected.

How long does the battery last?

It runs on a replaceable CR123A battery rated for around 5 years of use.

Is the Heiman Smart Water Leakage Sensor waterproof?

Yes, it carries an IP67 weather-resistance rating, suitable for damp placements like under sinks or near water heaters.

At a glance

Summary

Everything this water leak sensor supports, grouped by category.

Size & Materials
Weather Resistance (IP67)2.7 × 2.7 × 1.1 in (69 × 69 × 27.6 mm)
Connectivity
2.4 GHz WiFi
Integrations
Samsung SmartThings (Partially)Home Assistant
Sensors
Water Leak
Alerts
Water Leak AlertsLow Battery Alerts
Features
On Device Alert SoundOn Device Alert Light

Price History

Loading price history...

Company
Heiman logo

Heiman

4.5/ 5 avg ratingChina flagHeadquartered in China

Heiman is a Chinese manufacturer of smart safety and security sensors, including smoke alarms, gas detectors, water leak sensors and door/window contacts. The company produces Zigbee and Z-Wave devices used across many smart home hubs and is a common original equipment supplier for other brands. Heiman focuses on affordable, safety-oriented sensors for home automation.

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

2.7 × 2.7 × 1.1 in (69 × 69 × 27.6 mm)

Weight

?

Included accessories
Sensor Cable

NO

Power
Wired

NO

Battery Type

CR123A

Battery Life

5 years

Connectivity
2.4 GHz WiFi

YES

5 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

NO

Integrations
Google Home

?

Alexa

NO

Alexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either

Apple HomeKit

NO

Samsung SmartThings

Partially

Home Assistant

YES

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

YES

Tamper Alerts

NO

Features
On Device Alert Sound

YES

75 dB

On Device Alert Light

YES

Automations

YES

On sale now

9 other Water Leak Sensors on sale

View all
Head to head

Heiman Smart Water Leakage Sensor vs the competition

View all
Heiman

More from Heiman

View all