What power of electric heater to choose?


To properly heat your home without breaking the bank, it is important to ensure that you choose the right power for your electric heaters. However, this choice is not so simple since it is necessary to take into account several criteria, such as the location of the accommodation, its insulation, the volume to be heated or the desired temperature comfort. Let’s do a check in.

What are the criteria to take into account to determine the power of an electric heater?

To properly assess the power of an electric heater, it is important to take several criteria into account.

The volume of the room to be heated

Taking into account the volume is important, because a radiator that lacks power will run continuously and wear out prematurely to heat an area too large for it. Conversely, a radiator that is too powerful will never really work properly and can be exhausted by its disproportionate power.

To estimate the good power of an electric heater, it is necessary to base oneself on the volume of the room or its surface.

  • In terms of surface, there are 85 W / m².
  • In terms of volume (obtained by multiplying the area of ​​the room by the ceiling height), we count 30 W / m3.

Here is the recommended power according to the surfaces and volumes:

  • For a room of less than 10 m² (approximately 25 m3): 750 W
  • For a room of 10 to 15 m² (about 35 m3): 1000 W
  • For a room of 15 to 25 m² (about 50 m3): 1500 W
  • For a room of more than 25 m² (more than 55 m3): at least 2000 W

Likewise, for large rooms, be aware that it makes more sense to install two or more radiators than a single device that will run at high power all the time. It is in fact more economical to distribute the heat sources and this makes it possible to obtain a more harmonious effect.

The location of the accommodation

In an area where the outside temperature is very cold, the impact on the inside temperature will be greater, so you will need more powerful radiators. Count about 10% more as you climb up to 500m altitude stops.

Likewise, the exposure of the rooms of the dwelling is important. Rooms facing south will naturally be heated more by the sun’s rays than those located to the north. You can therefore reduce the heating power by around 10 to 15%.

The quality of the insulation

The more insulated your home, the less heat loss you will experience. As a result, your radiators will run less to heat better. There is no point in investing in efficient appliances if the insulation in your home is poor. It is recommended to review the latter before or at the same time so that your investment is profitable to you and allows you to achieve real energy savings.

Comfort temperature

Of course, the comfort temperature is important. If you are cautious, you will appreciate a more powerful radiator than if you withstand low temperatures. Likewise, if you have young children, a higher temperature may be necessary, especially in the event of a cold or minor ailments. As for the bathroom, it is a separate room that requires a rapid rise in temperature, but only when it is in use. It is therefore important to choose the right model.

What is the ideal recommended temperature per room?

Depending on the room, ideal temperature recommendations may vary. Here they are with the number of Watts recommended per cubic meter.

  • In a living room, kitchen or office, the recommended temperature is 20 ° C, or 77 W / m3.
  • In a room, the recommended temperature is 18 ° C, or 70 W / m3.
  • In a bathroom, the recommended temperature is 22 to 24 ° C, or 85 to 93 W / m3, but only when using it.

What are the specific parameters to take into account?

To complete your choice of electric heater, know that some very specific parameters must also be taken into account.

  • Wet rooms: for these, you need about 20 to 25% more power.
  • Rooms in high altitudes and rooms exposed to the north: for these spaces, count 10 to 20% more power.
  • Rooms facing south: for those rooms that are sunny all day, plan on 5 to 10% less power.
  • The adjoining rooms: in this case, a power reduction of 20% is possible.
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