Bath Thermometer: Review & Recommendations


Welcome to our big bath thermometer test 2020, where we present you all the bath thermometers 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 would like to make your purchase decision easier and help you to find the best bath thermometer for you.

You can also find answers to frequently asked questions in our guide. If available, we also offer you interesting test videos. Furthermore, you will also find some important information on this page, which you should pay attention to if you want to buy a bath thermometer.

The most important facts in brief

  • A distinction is made between two types of bath thermometers: analog and digital bath thermometers.
  • In general, digital bath thermometers can show you the water temperature more accurately.
  • There are many different models and designs. A distinction is made between bath thermometers for babies and for adults.

Bath thermometer test: editorial favourites

  • The best all-round bath thermometer
  • The best analogue bath thermometer
  • The best analogue bath thermometer for babies
  • The best digital bath thermometer for babies

The best all-round bath thermometer

This analog bath thermometer is perfect for you if you have minimal demands on your thermometer and do not want to dig deep into your pocket.

It is less suitable as a toy for children and more as a bath thermometer for adults. Customers appreciate the simple design and the long durability.

The best analogue bath thermometer

This analogue bath thermometer is set in beech wood and shows the temperature from -5 to 50 degrees Celsius.

This bath thermometer manufactured in Germany impresses with its elegant design and the rare round shape. It is not suitable for babies as a toy, but is still very decorative and reliable.

The best analogue bath thermometer for babies

The analogue bath thermometer from Nun is particularly child-resistant and with rapeseed oil as the measuring fluid is ideally suited for your child.

The thermometer is very handy and colourful, so your children will have a lot of fun with this product. It is also unbreakable and made of sturdy plastic.

The best digital bath thermometer for babies

This digital bath thermometer is in the shape of a penguin. In addition to the water temperature it can also measure the room temperature.

With its child-friendly design, it is also perfectly suited as a toy in the bathtub. In addition, it is childproof and has other convincing additional functions: it has a timer and a warning signal if the temperature limit entered is exceeded or undershot.

Guide: Questions you should consider before buying a bath thermometer

What is a bath thermometer?

A thermometer is a measuring instrument for determining temperature. A bath thermometer therefore measures the water temperature during bathing. Every thermometer we present here consists of a temperature sensor and a display of the measured temperature.

The water temperature is especially important for babies when bathing. But even if you use bath additives or even carry out medical applications, the temperature of the water is decisive. The right temperature ensures well-being and prevents burns caused by too hot water.

What types of bath thermometers are there?

For bath thermometers you can choose between two types of thermometers:

Analogue bath thermometers
Digital bath thermometers

Analogue bath thermometers usually work by the expansion of a liquid in the measuring tube. A scale is attached to this measuring tube from which you can read the water temperature.

Digital bath thermometers are mostly battery-operated, rarely they also work with solar energy. Digital thermometers have a display showing the exact water temperature. The temperature is measured either by the expansion of a liquid or electrical impulses.

What does a bath thermometer cost?

For bath thermometers the price depends mainly on the type of thermometer. In most cases analog bath thermometers are cheaper than digital bath thermometers.
Digital bath thermometers are usually more accurate and more complex in production, therefore they are more expensive than analog bath thermometers. In addition, digital bath thermometers often offer additional functions, such as measuring the air temperature in the room.

There are price differences depending on the manufacturer. A big difference is noticeable if you look specifically at bath thermometers for babies. As these must be suitable for children and very safe, they are often a little more expensive than bath thermometers for adults.

How do I use a bath thermometer correctly?

Basically all bath thermometers are waterproof, so you don’t have to watch out for possible water damage. A few digital bath thermometers have a measuring sensor which is not inserted in the device. Please read the corresponding instruction manual before use.

The optimal water temperature is between 36 and 41 degrees, pay the best attention to your well-being here.

You should use the bath thermometer to check the water temperature before you go swimming. To do this, the bath thermometer can be hung in the bathtub or put in the water. You should make sure that analogue bath thermometers have enough time to react to the water temperature. It is therefore recommended to leave them in the water for at least 2 to 3 minutes until the temperature is reliably displayed.

Very often bath thermometers are used with babies, here you should not rely on the thermometer alone, but also on your feeling and the well-being of your baby. The recommended bathing temperature for babies is 37 to 38 degrees.

Where can I buy a bath thermometer?

Bath thermometers are available in drugstores and department stores as well as in many online shops. Here you can search specifically for a bath thermometer for babies or for adults.

All bath thermometers that we present to you on our site are provided with a link to at least one of these shops. If you have found a suitable bath thermometer, you can strike immediately.

What are the alternatives to a bath thermometer?

As an alternative to a bath thermometer you can of course also rely on your feeling. If you are a diabetic, however, this is not recommended as the temperature estimation is often less accurate. A bath thermometer is also recommended if you want to bathe a toddler or baby.

Furniture & Equipment
Baby bath

However, if this is not for you, there is an adapter for your tap to regulate the water temperature. These are permanently installed and provide the

Decision: What types of bath thermometers are available and which one is right for you?

What characterizes an analog bath thermometer and what are its advantages and disadvantages?

Analogue bath thermometers have already proven themselves before the digital bath thermometers. They are easy to use and the scale should be easy to read. Before you buy, make sure that you have sufficient information about which liquid in the thermometer is used for temperature measurement.


Less prone to errors
Ease of use
Mostly cheaper than digital bath thermometers


Less accurate than digital bath thermometers
Depending on the liquid, hazardous to health if the thermometer breaks
Fewer extra functions (such as air temperature measurement)

Analogue bath thermometers are therefore mostly limited to their basic functions, but they are also cheaper and can last longer than digital bath thermometers if well maintained. To determine the exact water temperature is rather difficult with analogue bath thermometers, but they convince by their easy handling.

What characterizes a digital bath thermometer and what are its advantages and disadvantages?

Digital bath thermometers are usually a little more expensive to purchase. But they convince with extra functions and a digital display of the temperature.


More accurate than analog bath thermometers
Can measure the air temperature
Are less harmful to health


Rely on technical precision
More error-prone
Mostly more expensive than analog bath thermometers

Thanks to the digital display, the temperature can even be displayed down to a tenth of a degree. If a bath thermometer should break down, there are usually no dangerous measuring liquids installed.

The electronics are specially shielded, so there is no danger if your bath thermometer should break. Some customers still prefer analogue thermometers, as you always have to rely on the technology for digital versions.

Purchase criteria: With these factors you can compare and evaluate bath thermometers

Before you buy a bath thermometer, you should consider the following aspects:

  • Material
  • Liquid
  • Gestaltung
  • Accuracy


Both analogue and digital bath thermometers can be manufactured from a variety of materials.

Analogue bath thermometers often consist of plastic or wood. The measurement is usually carried out in a glass or plastic tube with the respective measuring liquid.

Of course, digital bath thermometers are also equipped with electronics. These include a variety of metals as well as a measuring tube and a liquid.

So the visible materials are particularly different. Often this is also a design issue: maybe you prefer a wooden bath thermometer or a plastic bath thermometer in your bathtub.


Besides the traditional mercury thermometers there are also thermometers with sunflower oil or alcohol.

The temperature is measured by the expansion of the liquid under heat or heat. Only a few liquids are therefore suitable for use in a thermometer.

Nowadays you should make sure that there is no more mercury in your bath thermometer. The developed alternatives work very well and are not harmful to your health.


The design of bath thermometers is varied, from brightly coloured to unobtrusive, you can find any type of bath thermometer. When designing you should therefore ask yourself the following questions: How long do I want to use this thermometer? Is the thermometer for a baby or for an adult?

If it is a bath thermometer for babies, you can choose a simple thermometer, which serves its purpose, or a colorful thermometer, which also serves as a toy.

If you are looking for a bath thermometer for adults, you can choose according to your personal preferences. These are usually simpler and often in muted tones.


Generally speaking, digital bath thermometers can give you a more accurate indication of the water temperature. But this is mostly due to the scale, not the temperature measurement itself.

The expansion of the liquid in analog bath thermometers can be measured very accurately. The only difference is that the attached scale is usually only in 1 degree Celsius steps.

Often you can still see whether it is exactly 37 degrees or just over 37 degrees, but an exact measurement to one decimal place is usually not available in analogue thermometers.

Digital bath thermometers, on the other hand, can display the temperature more accurately because the digital display is not a scale, but only shows the result. Many digital bath thermometers can even display up to two decimal places, for example 37.52 degrees Celsius.

Trivia: Worth knowing facts about bath thermometers

How do I clean a bath thermometer?

When cleaning bath thermometers, there is little to consider. Cleaning is recommended in order to be able to use the product in good condition for as long as possible.

Bath thermometers are actually very easy to maintain. They are designed to be waterproof and insensitive.

Especially analog bath thermometers are easy to clean. Here it is sufficient to rinse the thermometer at the bottom with clear water after bathing to remove any remains of bath additive or soap. Cleaning agents that remain on the thermometer could attack the plastic after some time.

Digital bath thermometers are also usually very easy to clean. For most of them, rinsing under clear water is sufficient to keep the thermometer functional for a long time. If in doubt, however, read the operating instructions again to avoid damage.

Can I measure the air temperature with my bath thermometer?

Most digital bath thermometers can also measure the air temperature with their sensor. Some can even measure and display humidity. If your bath thermometer of choice has these functions, you should find out beforehand and possibly ask the manufacturer.

What do I do if my bath thermometer is broken?

Every household has its share of breakdowns. Whether it is an analogue or digital bath thermometer makes hardly any difference.

First of all, don’t panic. Nowadays most bath thermometers do not contain any dangerous liquids and substances.

In any case, make sure that you do not injure yourself with the individual parts of the broken thermometer. Often glass is still used, especially in analogue bath thermometers.

If you were just about to take a bath, you will probably have to rely on your feeling without your bath thermometer. With digital bath thermometers: always have spare batteries at hand.

How do I dispose of a bath thermometer?

To find out where you dispose of your bath thermometer, you first have to find out which substances are used.

In the following table we have summarized how and where you can dispose of your old bath thermometer.

Older, analogue bath thermometers may still contain mercury. In this case your thermometer must be disposed of in the hazardous waste, not in the domestic waste.

Digital bath thermometers should be taken to the nearest recycling yard or reusable materials centre. Analogue bath thermometers can also be returned there. However, if your analogue thermometer contains sunflower oil or alcohol as liquid, you can also dispose of it in your household waste.

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