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Warm Floor

August 12, 2017 18:07

How to calculate the power of a warm floor ?

One of the auxiliary heating options in the apartment is a system of heating floor.This option is very popular today and can be used not only in the apartment building, but in a country cottage, in the country and even in the bath.Before proceeding to the installation of the heating system of this type, it is necessary to calculate its power not to overpay for the excess heat and at the same time does not make it slabomoschnoy.To learn how to correctly calculate the electric underfloor heating power and area of ​​the room, and we'll talk further!

  • technology computing
  • illustrative example

computing technology

Immediately it should be noted that today there are services such as online calculators and calculation programsunderfloor heating for individual conditions.These programs are really very comfortable and allows to immediately determine the exact capacity of the coating film or the heating cable.If you for some reason do not trust computer calculations, we are sure to do everything the old fashioned way - using simple formulas.

independent calculation

So, the formula for calculating the electric underfloor heating is as follows:

P = Pm * Skomn ,


  • Pm - the power of the heating of the material, which you yourself have to choose (see below) m2;
  • Skomn.- Useful area of ​​a room.

As you can see, for the calculation of the formula is not far from the complex, but there are two unknowns, you have to define yourself.As for the usable area of ​​the room, everything is simple.Heating mat, cable or film should be laid only in those places where there is no standing household appliances and furniture.Firstly, because this is forbidden by manufacturers becauseforeign objects on the floor will hinder heat exchange, resulting in a material will overheat.Secondly, what is the heated surface, where no one will go?This is a waste of electricity.In the diagram you can see, it looks like a useful area of ​​a room for the calculation of the electric floor heating:

Useful heating area

Useful heating area

calculation of usable space for the installation of electric underfloor heating is as follows: the width of the surface to be multiplied by the length.

With regard to the power of the heating of the material, it you have to choose your own, depending on the type of room.power infrared film or mat will be different for each room, which is obvious - a balcony and a corridor in greater need for heating than the bedroom and children that are further heated radiator.

We offer to you the best possible value for the calculation of the power of the electric floor heating:

  • Kitchen: 110-130 W / m2;
  • Bathroom (WC): 120-150 W / m2;
  • Balcony: 180 W / m2;
  • Hallway: 110-120 W / m2;
  • Corridor: 110-120 W / m2;
  • Living 110-130 W / m2;
  • Bedroom 110-130 W / m2.

Please note that the above values ​​are appropriate in the event that electric floor heating is used as an additional heating system.If you decide to use this option as a central heating system, you need to choose the heating capacity of the material of 140-180 W / m2 for each room;

Living space you know, power parameters are also selected.It only remains to substitute the values ​​into the formula and make the overall calculation of floor heating electric power.To help you understand how to calculate this parameter, then we will provide an example for one of the rooms.

illustrative example

For example, we need to calculate the heated floor area of ​​25 m2 living room.Imputed utility room area.Since the living room we have a sofa, armchair, table and wardrobe, useful area is only 60% of the total.

Skomn = 25 * 0.6 = 15 m2

next step - you need to select the power conductor, which in our case is the heating cable.There is one very important caveat - cable sold with the feature is not W / m2, and W / m.You should independently choose the step of laying the material on a 1 square meter.For example, selecting a cable with a parameter of 30 W / m, it is necessary to stack increments of 20 cm, to get the value of 150 W / m2.Returning to the calculation, and according to the recommendations we receive optimum value for the living room - 110 W / m2 (in addition be present central water heating).

Substitute the values ​​into the formula, and then, using a calculator, compute power:

P = 15 * 110 = 1650 watts

with the calculated values ​​are going to the store and buythe appropriate size of the heating material.Example calculation works, you can also view the video:

How to calculate the capacity of a floor heating system
YouTube Preview

That's the whole technique of calculating the electric underfloor heating power and the square room.This formula is suitable for determining a required power when laying the material under the laminate, and a mounting tile.Recommended immediately calculate how much consumes a warm floor in your case to compare with other types of electric heaters.Perhaps this heating option will be for you too expensive, and more effective solution would be to connect infrared heaters.

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