Dimension a wall heater

The wall heating enjoys increasing popularity. This is not just a fad. In fact, the wall heating offers very special advantages. Important is always the correct dimensioning of the wall heating. That depends on various factors. How to dimension a wall heater is explained here.

Wall heating versus conventional heating (convection heating)

A major advantage of wall heating is the fact that radiant heat is used here. Conventional heaters work on the principle of convection heat. That is, the air must be heated to the temperature that is also felt. Radiant heat does not heat the air, but it does heat objects and bodies that are being illuminated.

In a room with convection heating, the room air must be 21 degrees Celsius to be perceived. In a room with radiant heating, 18 degrees are enough to also achieve the feeling of 21 degrees heat. Considering that the additional energy required for each degree of heat gaining six to seven percent more energy, it quickly reveals a significant savings potential.

Similar to the underfloor heating

It is not even considered that even this heat itself is perceived as comfortable. In principle, the wall heating is therefore similar to a floor heating system. Only that even compared to the floor heating, the heat of the wall heating is also perceived as much more pleasant.

The wall heating is a surface heating...

From the principle of radiant heat it can already be deduced that it has to be a large-area heating system. Basically, DIN EN 1264 Part 2 and DIN EN 12831 can be consulted to suitably dimension a wall heater. However, many factors influence the heat output:

  • Insulation of the wall
  • flow temperature
  • Density of the heating pipes
  • window area
  • later cladding of the wall

... what to consider when dimensioning

The insulation of the wall is a fundamental factor. This significantly influences the required flow temperature. This, in turn, should be below 45 degrees (between 30 and 45 degrees). In an old building without sufficient thermal insulation to the outside, the wall heating is problematic because too much heat is radiated to the outside. This significantly increases the required flow temperature.

Similar to the floor heating is also important how closely the heating pipes were laid to each other. Therefore, the usual dimensions here help with wall heating on. In addition, always the outer wall should always be provided with the wall heating. Otherwise it can lead to negative peculiarities such as a cold train on the feet.

Rule of thumb: 20 to 30 percent of the living space for wall heating

Of course, since the wall surface of the outer wall is provided, the area of ​​the windows plays an equally important role. If all these factors are clarified, it can be assumed under normal to optimal conditions that the wall heating with a size of 20 to 30 percent of the living space (of the relevant room) should be dimensioned.

Tips & Tricks

In the meantime, suppliers and manufacturers of wall heaters also offer small programs for calculating. But for a serious calculation also data such as the U-value for the relevant wall are a decisive factor for the correct dimensioning.

Artikelbild: Ivanko80 / Shutterstock

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