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.  

more

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. 

more

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.

360 Grad 3D

Our products in a new dimension.

Rotate the product in all directions, zoom in and experience it in three dimensions. This gives you a detailed picture of your favourite products.

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

find out more

Deter burglars

Homematic IP Alarmsirene außen an Hauswand
find out more

Use the app

find out more

Understand our products

Test
find out more

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.

Find out more

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!
find out more

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.
Find out more

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.

FAQ

FAQs

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

Service

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.

Installateur Suche

Specialist tradespeople

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

Händler Suche

Dealers

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

Innovations, ideas, impulses: your news

Get first-hand news about the latest innovative smart home solutions. 

View all news

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)
Homematic IP User Guide

Version: July 2025

20.99 MB
Overview of Homematic IP QR Code Stickers
50.09 KB
Operating manual Water Sensor

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

2.76 MB
Data sheet Water Sensor

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

1.19 MB
Declaration of conformity Water Sensor

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

126.32 KB