Water Detector: Review & Recommendations

Welcome to our big product test 2020, where we present you all the water detectors we have tested in detail. We have put together detailed background information and also added a summary of the customer reviews on the web.

We want to make your purchase decision easier and help you to find the best water detector for you.

You can also find answers to frequently asked questions in our guide. If available, we also offer you interesting test videos. On this page you will also find some important information that you should pay attention to if you want to buy a water detector.

The most important facts in brief

  • Small, inexpensive water detectors in households help to protect against major water damage. They can be placed especially in places where no obvious water damage can be seen.
  • The small household gadgets are now available everywhere and with a WLAN function they can be connected to the Smarthome network, so you get a notification even outside the house what is happening at home.
  • The water sensors are installed directly on the unit or on an external cable. If you are thinking about buying a water detector, you should pay attention to the area of application and the additional functions.

Water detector test: Editors’ favourites

  • The best smart water detector
  • The best water detector with humidity and temperature gauge
  • The best water detector with 85 decibel

The best smart water detector

The Homematic IP model is a smartphone-enabled device. In case of water leakage you will receive a push notification via a previously installed app. From a height of 1.5 mm, the device warns of potential water damage.

You can either place the appliance on the floor (near your washing machine, for example) or hang it on the wall.

The best water detector with humidity and temperature gauge

The GROHE model is a smarthome-enabled appliance. If water escapes, you will receive a push notification. Furthermore, this device can also measure temperature and humidity data and warns if the set data is exceeded or undercut.

The sensors of this water detector are mounted directly on the device. In case of contact with water, the detector sounds an alarm and its LED light also indicates if the acoustic signal should fail. This device is a little bit cheap, but a suitable gadget in the Smarthome range.

The best water detector with 85 decibel

The water detector from Mumbi is ideal for the bathroom, kitchen and cellar. To avoid false alarms, the device only reports an alarm when all three sensors come into contact with water.

The alarm has a volume of 85 decibels. The device can be tested with a wet cloth and can only be turned off by removing the 9V battery. The detector can be positioned anywhere and provides security.

Advisor: Questions you should deal with before you buy a water detector

What is a water detector?

A water alarm is an electronic device that triggers an alarm when the liquid sensor comes into contact with water.
These devices are very useful in homes (especially basements) to protect against water damage and mold growth caused by leaking water pipes, broken plumbing, a clogged sewer, or drainage caused by a heavy storm.

Slow leaks in equipment and sanitary fittings often go unnoticed. Excess moisture and water from a slow leak can severely damage the floors and walls of the house.

A water detector already informs if there is a moisture problem.

How does a water detector work?

There are two types of water detectors, passive and active. The passive detector uses a 9-volt battery. The water detector has a moisture sensor that has three electrons on the ground and measures the electrical resistance.
An alarm is triggered if this sensor gets wet. Damp places or high temperatures can reduce the battery life. Therefore the detector should be checked regularly to ensure that it is working properly.
Active water detectors can operate a single device or control the entire house. This system also generates an alarm and automatically turns off the water supply.

For whom is a water detector suitable?

In principle, a water detector is suitable for everyone. The many advantages make the detector for the water one of the most popular smart home gadgets that you can currently buy.

Above all, a water detector is suitable for households that do not want to spend money on high water damage.

With a water detector, major damage that can be caused by flood water in any house can be avoided.

When you think of the consequences of flooding, the first thing that comes to mind is the material damage, but physical damage can also occur. People whose health is at stake should therefore also get a water detector.

Even if the situation is not serious and one quickly drains water, dries floor, walls or furniture, the risk of mould formation is very high.

Moisture causes mould spores to multiply within 24 hours after a leak. They pollute the air and threaten human health.

Sneezing, allergies and even asthma can be triggered by fungi. Mould is very difficult to remove because the spores spread everywhere where there is moisture.

The video below emphasizes again why the purchase of a water detector pays off:

What does a water detector cost?

Depending on the desired extra features besides the simple message when there is too much water, the quality and the case, the prices vary between 10 and 60€.

Which further purchase criteria are to be considered, which also influence the price, can be found further down in this article.

Where can I buy a water detector?

Water detectors can be found in department stores, supermarkets and specialist shops, as well as in many online shops. You can often find inexpensive water detectors at discounters.
According to our research, most water detectors are bought in these online shops:


If you are looking for a kitchen radio, you will notice that there are a large number of brands and manufacturers. Popular and recommendable brands are:

  • Abus
  • Blaupunkt
  • Grohe
  • Honeywell
  • Homematic
  • Mumbi
  • Gipfel
  • VisorTech

Decision: What types of water detectors are there and which one is right for you?

If you want to get a water detector, there are several ways you can choose between:

  • Battery operated water detector
  • Water detector with cable

The use of different types of water detectors has both advantages and disadvantages.

Depending on what you prefer and what you want to use the water detector for, a different type is suitable for you. With the following section we would like to make the decision easier for you.

What distinguishes a battery-powered water detector and what are its advantages and disadvantages?

Battery-powered models, as the name suggests, only work with one battery and have the advantage that they can be mounted anywhere.

You can place this device on the floor, or attach it to something with an adhesive strip and it is ready for use.

With a battery-powered water detector, the sensor is located in the actual device; instead of the sensor, so-called probes can also be attached.


Sensor directly on the device, no mounting effort
Flexible positioning of the water detector
Acoustic alarm on detection of Wa


Little flexibility in assembly
High water level damages the device
Might be in the way.

What distinguishes a water detector with cable and what are its advantages and night

The water detectors that come with a cable must be mounted on the wall, a cabinet or other object.

They guarantee stability when everything has been assembled correctly. It is important to ensure that the cable is of sufficient length.

This model has a cable attached to it, and the sensor that will later alarm when it comes into contact with water is built into the cable. The cable must touch the ground for the sensor to work.


Suitable for large areas
Detects water along the entire cable length
Acoustic alarm when water is detected
Device remains undamaged at high water level
No batteries need to be changed


Little flexibility in assembly
If the cable no longer works, the device cannot give a signal
There must be a power socket nearby
The devices with an external sensor are usually more expensive

Purchase criteria: You can compare and test water detectors based on these factors

In the following we would like to show you which factors you can use to compare and evaluate water detectors. This will make it easier for you to decide whether a particular water detector is suitable for you or not.

In summary, these are:

  • Material
  • Montage
  • Sensor
  • Volume
  • WLAN
  • Additional functions

In the following paragraphs we will explain what is important for each of the criteria.


Most water detectors are made of plastic, but there are also models made of aluminium. It is important to note where the device is to be used and that the water detector does not have any dents.


Before the purchase you should think about where the water detector should be placed.

Depending on the location to be served, it is important that the supplier also supplies the material necessary for assembly and that assembly jigs are taken into account.


It should be remembered that for large areas the sensor should be attached to the cable. The so-called measuring sensors are located on the cable.

A higher number of sensors also ensures a more reliable signal in case of water damage. The longer and the more sensors are out of the water detector, the larger the monitoring range.


The water detector only fulfils its purpose if it emits an appropriate tone that is perceived by a person in the household, so that no damage occurs.

The alarm should be at least 85 decibels loud so that it can be heard throughout the house.


Water detectors with WLAN function enable the device to be included in the smart home network and controlled from a smartphone.

So if you have a “smart” water sensor, it can send out a smartphone alert when someone is at home or not.

Additional functions

In addition to flood protection, some water detectors include a temperature warning, so you don’t have to worry about frozen pipes and extreme temperatures.

Some models can also control the humidity.

Measuring tools
Moisture Meter

There are also water detectors that have LEDs that light up when the unit detects a leak or has battery or connection problems.

Trivia: Important facts about water detectors

This section contains frequently asked questions that consumers ask themselves after buying a kitchen radio.

How and where do I install a water detector?

It is best to install a water detector on household appliances that run on water. For example under a dishwasher, where water often escapes unnoticed.

WashingWashing machines
washing machine

Also the washing machine, which is usually located in the basement, could cause water damage.

The washing machine or even the dryer are usually unattended in operation and something can quickly happen where the water detector can help prevent major damage.

However, defective showers, bathtubs, toilets are the water damage danger number 1.

Under the shower or bathtub it is difficult to see if a pipe has burst and when you see it, it is usually already too late.

Therefore you should definitely consider installing a water detector under the shower.

Did you know that the bathroom is the most popular place for the water detector?
In the bathroom there are several areas of application for water detectors. There are water pipes to the sink, bathtub and shower.

What should I do if my water detector no longer works?

Water detectors can no longer function for a variety of reasons.

If this does not solve the listed problems, it is advisable to check the device for external damage and, in the case of major defects, to take the device to a specialist or refer to the device warranty.

How do you maintain a water detector?

Often ignored or forgotten water detectors are not maintenance-free and must be serviced regularly.

Usually the systems have to be checked every 3 or 6 months, depending on the installed system and the environment in which the system is installed.

It is often forgotten that the water leak detection system was installed for a specific reason.

Only by calling in a specialist for leak testing to perform system checks and maintenance work can you be sure that the water detector provides adequate protection for your home.

In this video you can see how to turn a smoke detector into a water detector: