**This question is the most important when it comes to the purchase of infrared heaters. If one has decided for an infrared heater, and thus against other heating methods, the question is how many watts (power) does an infrared heater need for which room size.**

The following are the most important bases for understanding this question to give a reasoned answer to this question

## Which factors influence?

### Room size as a factor

To understand how the required performance for a room is composed, it is necessary to have the basic values of an apartment.

The most important value is the volume, i.e., the size of the room. This can be easily measured and calculated; one should avoid estimating because usually the real size of a room is underestimated.

### Number of external walls as a factor

The second important value is the number of external walls of the room. **Exterior walls give off much more heat than walls that point to other rooms. **In the best case, one profits even more effectively from the heating of the adjacent flat. The basic calculation of the required power is based on 1 to 4 possible outer walls.

### Annual average temperature as a factor

The third important factor is now the average annual outdoor temperature. For this, you can simply for the place you live **on the Internet or Atlas** read the annual average temperature and thus get a reliable value for this temperature.

### K value as a factor

The last important factor is the so-called K-value. The K value indicates how much a component, in which case the walls and the windows, is thermally insulated, i.,e. How much heat is lost through this part? **This value is given in Kelvin per square meter. **Distinguishing between windows and walls is important.

### The factors at a glance:

- Room size. The larger space, the more power is needed.
- Exterior walls. The more exterior walls, the more power is needed in the heating.
- Annual average temperature. The warmer the less power is needed.
- K-value. The larger the K-value of the walls, the more power is needed.
- Window. The more glass surfaces in a room, the more heating power is needed.

## Sample values

The example values refer to a **room height of 2.5 m** and a **K value of 0.3 ****on the ****walls** and 1.1 on the windows.

- 300 watts, up to 7 m², six m², five m², four m²
- 400 watts, up to 12 m², ten m², eight m², six m²
- 500 watts, up to 14 m², 12 m², ten m², eight m²
- 600 watts, up to 16 m², 14 m², 12 m², ten m²

[Output, heated room with one outer wall, two outer walls, three outer walls, four outer walls]

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