A radiator equipped with an open window detector helps prevent heat loss when you air out a room. Thanks to its built-in temperature sensor, it detects sudden temperature drops characteristic of an open window and automatically adjusts its operation.

This feature is now present on many recent electric radiators compliant with the European EcoDesign standard* **. The goal is to promote eco-design for energy-related devices such as heating equipment. It contributes to more efficient heating use on a daily basis.

How does the automatic open window detection work?

Contrary to what one might think, no external sensor needs to be installed on the window. Everything happens directly inside the radiator:

• Its internal sensor continuously measures the room temperature.
• When it detects a rapid and unusual temperature drop, the system interprets it as an open window.
• The radiator then reduces its power or temporarily suspends heating.

This technology is integrated into all Bestherm radiators and heated towel rails to simplify heating management and avoid unnecessary consumption during airing periods.

Why choose an electric radiator with open window detection?

When you open a window to refresh the air in a room, a conventional radiator usually continues to heat. It tries to compensate for the temperature drop, even if it is temporary.

With open window detection, the radiator recognizes this situation and automatically adjusts its behavior. This prevents heating wasted during a few minutes of airing.

Combined with programming adapted to household habits, it contributes to more efficient heating management throughout the year.

Connected, dry inertia, or fluid: which model to choose?

Open window detection is available on several types of electric radiators. The choice of model mainly depends on your needs and lifestyle.

The connected radiator: control your heating remotely

Connected radiators allow you to manage the home temperature from a smartphone or tablet. Through an app, you can change heating settings, adjust programming, or monitor device operation remotely.

Combined with open window detection, this remote management offers better control of the home’s energy consumption.

The connected radiator thus makes it easier to adjust heating according to your needs and habits.

Ceramic or cast iron: which heating core to prefer?

Open window detection is especially useful on dry inertia radiators. These devices store heat in a refractory material before gradually releasing it into the room.

When a window is open, the detection function prevents unnecessary use of the heating core during airing.

The two main dry inertia technologies are ceramic and cast iron. Each has its own characteristics in heat diffusion and storage, but both benefit from the advantages of automatic open window detection.

To further optimize heating, some models can also be equipped with a presence detector (PIR) capable of adjusting heating based on room occupancy.

FAQ: Everything you need to know about radiators with open window detectors

Is it mandatory to buy an external sensor for the radiator to work?

No, no external sensor is necessary.

The radiator uses its own internal sensor to analyze temperature variations in the room and identify temperature drops characteristic of an open window.

Are Bestherm radiators equipped with open window detection?

Yes, all Bestherm radiators and heated towel rails include this feature.

When a rapid temperature drop is detected, the device automatically adjusts its operation to avoid energy waste during airing.

What energy savings can be expected with this feature?

Energy savings vary depending on airing frequency, home insulation, and heating habits.

Open window detection does not replace good programming or effective insulation, but it helps avoid some unnecessary consumption and contributes to reducing daily energy waste.

* The European EcoDesign regulation aims to encourage the design of more energy-efficient and resource-friendly products. It applies notably to energy-related equipment, such as heating devices, to promote eco-design and reduce their environmental impact.

** https://europa.eu/youreurope/business/product-requirements/compliance/ecodesign/index_en.htm