Water sensor

Immediate alarm if water escapes.

The worry's always there: The cellar fills up due to heavy rain or the washing machine is faulty, causing large amounts of water to escape. That can cause serious damage. With the Homematic IP smart water sensor, you'll feel safe in your smart home. Because if there's a water leak, the sensor alerts you with the integrated loud siren and also via notifications in the app. 

Wasserhahn mit Warnschild

Detect water leaks early

Merely dampness and very small amounts of water are reliably detected and indicated.  

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Three measuring probes detect even small amounts of water. Another probe detects a water level from a height of 1.5 millimetres. 

Haus mit Schutzschild

All-round safety and an immediate alarm 

The Homematic IP app gives you an overview of everything and you can be sure that everything's as it should be at home. 

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If there is a water alarm, you are informed immediately in the app via a push message. Movement of or tampering with the water sensor is detected and reported to you. That's done via the smart product's built-in incline sensor.

Alarmanlage

An individual choice of alarm signals

Choose whether the water sensor should trigger only in case of moisture, only in case of water or in both cases. You can also set the alarm signal individually - both audibly and visually - as well as the alarm duration. 

You can conveniently set all the functions in the Homematic IP app. 

Haus mit Ausrufezeichen

Alarm throughout the house

Combine the water sensor with a Homematic IP alarm siren (e.g. HmIP-ASIR-2) – the alarm will then also be emitted via the siren. 

Homematic IP Zeichen mit Rahmen

Ready for use without installation

Simply put the water sensor in place and that's it! 

The device detects moisture on different surfaces and, with its spring-mounted measuring probes, also adapts flexibly to sloping floors.

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Our products in a new dimension.

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Your advantages at a glance

Do you want to live more safely, save money and protect the environment, or simply increase your living comfort? There are many good reasons for a Smart Home. Find out more now!

Control access

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Deter burglars

Homematic IP Alarmsirene außen an Hauswand
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Use the app

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Understand our products

Test
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Your advantages at a glance

Do you want to live more safely, save money and protect the environment, or simply increase your living comfort? There are many good reasons for a Smart Home. Find out more now!

05. July 2023

Travel with a safe feeling: How to protect your home with smart home technology

No one there to look after the house during the holidays? No problem, because your Smart Home protects itself: It keeps burglars away and lets you know immediately if something should happen.

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Homematic IP: Smart living. Simply exciting.

Homematic IP means modern, flexible and secure technology from the European market leader*. Let the advantages of our system win you over, and start living smarter straight away. 

Homematic IP
With some smart home providers, you have to make a choice: Do you have everything wired, or do you go fully wireless? Some systems are also hermetically sealed and do not accept devices from other manufacturers. Here at Homematic IP, we have a different approach. We are guided by you!
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Die Homematic IP App

Konfigurieren Sie in der Homematic IP App alle Einstellungen für Ihr Smart Home, steuern, regeln und überblicken Sie damit jederzeit Ihre Geräte. Es werden keine persönlichen Daten erhoben, außer der IP-Adresse.

The Homematic IP app

Configure all the settings for your smart home in the Homematic IP app, and use it to control, regulate and monitor your devices whenever you want – without providing any personal data!
Homematic IP Wired
A smart home system is particularly robust, interference-proof and reliable when the devices communicate with each other via wired connections. And data transmission is very fast with cables, too. That all comes together with Homematic IP Wired.
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Always here for you and your queries.

Whether you have a question about a product, something isn’t working as you wanted, you’re looking for a specialist partner, or you simply want to give us feedback: we are always here to help.

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FAQs

This is where you’ll find the most important questions and our answers about our smart home solutions.

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Service

Have you purchased a Homematic IP product and now have questions about how it works? Our technical support team will be happy to help you.

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Specialist tradespeople

Are you looking for a good specialist tradesperson near you? Simply use the convenient search function here on our website.

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Dealers

You can get Homematic IP products and good advice all over Germany. Find the right dealer near you here.

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Order information

Product Name (Short)
HmIP-SWD
Item Number
151694A0
EAN Code
4047976516940

Technical data

Supply voltage
2x 1.5 V LR03/micro/AAA
Typical battery life
5 years (typical)
Degree of protection
IP44
Dimensions (W x H x D)
80 x 80 x 30 mm
Ambient temperature
-20 to +55 °C
Weight
78.2 g (including batteries)
Radio frequency
868.0-868.6 MHz/869.4-869.65 MHz
Typ. open area RF range
230 m
Volume integrated siren
approx. 77 dB (at a distance of 1 meter)

Product presentation: Water sensor

General

Homematic IP User Guide

Version: July 2025

20.99 MB
Overview of Homematic IP QR Code Stickers
50.09 KB

Operating manuals

Here you can download operating instructions for our Homematic IP products.

Operating manual Water Sensor

Short description: HmIP-SWD | Product reference: 151694A0

2.76 MB

Product data sheets

See our data sheets for features and technical specifications of our products.

Data sheet Water Sensor

Short description: HmIP-SWD | Product reference: 151694A0

1.19 MB

Declarations of conformity

All EU declarations of conformity for download.

Declaration of conformity Water Sensor

Short description: HmIP-SWD | Product reference: 151694AxC

126.32 KB