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Inscreed Cable System

The Warmup Inscreed Cable System can be covered with any flooring, and is excellent for installing within screeded floors of any size.


All floor coverings

Embedded within screed

Large or small areas

Regular or irregular shaped areas

New construction

The Inscreed Cable System is designed for installation in concrete screed of 50mm to 100mm. If insulation is absent or beneath more than 100mm of concrete subfloor, insulation must be used to ensure optimum heat-up times. The system is designed for installation within screeded floors, and is ideal for new-build projects where floor height is not an issue. It is suitable for almost any flooring finish and ideal where the flooring (wood, carpet, vinyl) may be replaced from time to time.

The slower heat-up and cool-down time of the system makes it particularly suitable for rooms which are in constant use, as the screed can be used as a form of storage heating, making effective use of cheaper, low-tariff energy usage.

Key Benefits


Flooring can be changed periodically

Without damaging the heating cable, saving money and increasing flexibility.


Different wattage densities

The heating cable can be laid at different spacings to give different wattage output, depending on the insulation levels of the building and the client requirements.


Suitable under any floor finish

The system is covered by a minimum 30mm screed layer, thus on top any floor finish can be installed.

Guarantee & Warranty

SafetyNet Installation Guarantee

If you accidentally damage the heating system during installation, return it to Warmup and we will replace it with another system of the same make and model free of charge.

10 Years Warranty

This product comes with a 10 Year Warranty. We are completely confident in the standard of our products.

Operating voltage 220-230V AC, 50Hz
Cable thickness 6mm
Inner Insulation Advanced fluoropolymer
Outer Insulation Polyolefin (PVC)
Output rating 100 to 210W/m²
Cold tail length 2.5m
Certificates vde accreditations-CE
Model Cable length (m) Wattage (W) Amperage (A) Resistance (Ω)
WIS180 9,0 180 0,8 294
WIS280 14,0 280 1,2 189
WIS390 19,5 390 1,7 136
WIS500 25,0 500 2,2 106
WIS650 32,5 650 2,8 81
WIS760 38,0 760 3,3 70
WIS1000 50,0 1000 4,3 53
WIS1200 60,0 1200 5,2 44
WIS1460 73,0 1460 6,3 36
WIS1550 77,5 1550 6,7 34
WIS1770 88,5 1770 7,7 30
WIS2070 103,5 2070 9,0 26
WIS2600 130,0 2600 11,3 20
WIS3140 157,0 3140 13,7 17
WIS3370 168,5 3370 14,7 16

  1. Final floor
  2. Screed (50mm)
  3. Heating cable
  4. Metal fixing bands
  5. Insulation
  6. Subfloor

The WIS heating cable can be installed under any floor finish and was designed for installation within a minimum 50mm of screed. The system is versatile and can be installed at different wattage densities.

As a standard the system is installed between 100 and 130W/m² in large areas and between 130 and 150W/m² in small areas such as bathrooms. To be on the safe side a heat loss calculation should be made before deciding on the wattage density required.

To specify the required materials it is needed to determine the available floor area to heat. This area corresponds to the total area of the space minus the surface occupied by fixtures (such as kitchen units, toilet, bathtub, etc). The area to heat is equal to the surface where circulation is possible.

Step 1: Measure room dimensions

Work out the total floor area. If the overall room is rectangle in shape, for instance like in the image 4m by 2,7m, the total area is 4 x 2,7 = 10,8m².

Step 2: Disregard any area taken up by furniture

Work out how much of the floor space is taken up by fixed objects. In the example shown the following fixtures can be measured as follows:

Bathtub: 0,9 x 2,7 = 2,43m²

Basin + Toilet: 1,5 x 0,8 = 1,2m²

The total area occupied by fixtures is 3,63m²

Step 3: Determine the floor area to be heated

The total floor area to be heated will be the total area minus the area occupied by fixtures: 10,8 – 3,63 = 7,17m².

Step 4: Select the heating cable size

Assuming the wattage density required is 140W/m², first calculate the total wattage required for the room (area x wattage density): 7,17 x 140 = 1003,8W. This means the choice will fall on the 1000W cable (WIS1000), according to the heating cable dimensions table.

To calculate the spacing between cables (spacing between cable loops) the following equation applies:[Area (m²) / Cable Length (m)] x 100 = Cable spacing (cm)

In the given example it will be:[7,17 / 50] x 100 = 14,3cm


The system must be controlled via thermostat and we recommend the use floor insulation in order to improve savings and system performance. In new construction projects floor insulation is already existing, however if that is not the case, Warmup can supply insulation boards.

There are several different methods to fix the heating cable. If the method used includes the metal fixing bands, the amount of metal fixing bands rolls can be calculated as follows: cable length / 6 / 25. In the example given this would be 50 / 6 / 25 = 0,33, which has to be rounded to 1 roll.

Also needed


Choosing the correct control system is crucial in ensuring that the heating system works in the best possible way, efficiently and easily

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Insulation Boards

Using Insulation Boards with floor heating significantly reduces the heat-up times and running costs.

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Metal Fixing Bands

Required to fix the WIS heating cable to the floor, prior to covering with screed.

Read more