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Vysa-Cable18W In-Screed Cable

inscreed cable kit

  • Ideal for new-builds, refurbishments and extensions, especially conservatories
  • Designed to be covered by 50-75mm sand and cement screed
  • Can be installed in a bathroom or shower room


Vysa-Cable18W In-Screed Cable

Vysa-Cable18W In-Screed Cable is ideal for installation into the floor screed or concrete floor slab of new-build and refurbishment extension projects.

in screed cable


It is also available as a kit.

The Vysa-Cable18W Screed Cable is designed to be embedded within a 50mm (2″) floor screed of sand and cement or a similar concrete slab. It MUST NOT be used directly under ceramic tiles.

Installation into wet areas

Vysa-Cable18W Screed Cables have an earthed metallic sheath beneath their outer jacket. They fully comply with the requirements of Section 701- 753 of the IEE wiring regulations BS 7671:2008 so may be embedded in the floor below any zone of the bathroom or shower room. They are approved to IEC 60800.


Technical Data

Naturally, Vysa-Cable 18W Screed Cable is the latest twin conductor design

How many W/sq m are needed? The specification / construction determine the heat loss of the room or dwelling. To maintain equilibrium the energy input must balance the heat lost. Electricity consumption is not governed by the W/sq m rating but by the thermostat and how it is programmed to control the underfloor heating system.

If you have heat loss data, you can simply choose a kit with the power rating that you need and then lay the heating cable at a cable spacing that will enable the whole length of cable to be used evenly across the floor area. If the cable spacing data in the table above doesn’t suit your application you can easily calculate the cable spacing required

Don’t worry if you don’t have heat loss data! You can simply choose a suitable W/m2 rating and read off the appropriate heating mat for your particular requirement from the table above. 150W/m2 is generally suitable for most primary heating requirements but in well or very well insulated dwellings to the latest design specifications 130W/m2 or even less can be suitable. 200W/m2 is generally suitable for most primary heating requirements in bathrooms and areas of higher heat loss such as conservatories and other similar constructions.

If in doubt, use a greater value of W/m2 rating. It is NOT the W/m2 that determines running costs but the thermostat setting and insulation provision.

Installation can be made much simpler by holding the cable in place with Screed-Fix fasteners while the concrete is poured onto the installation.

Voltage: 230 / 240V ~ 50Hz

Earth shield protection provided

Protection against electric shock: Class 2

Protection against water ingress: IP67

Cold tail connection cable: 3m

Flexible conduit provided for floor sensor

Heating cable diameter: 6mm (nom.)

Outer jacket: PVC

CE marked

Approved to IEC 60800

Order just the cable or as a kit

Order code cable ONLY Order code in-screed cable kits Cable Length (m) Nom. 125W/m2 cable spacing 15cm = room area m2 Nom. 140W/m2 cable spacing 12cm = room area m2 Nom. 160W/m2 cable spacing 11cm = room area m2 Total Wattage
2534 SK160 8.5 1.3 1.1 1.0 160
2535 SK260 14.5 2.0 1.8 1.6 260
2536 SK320 18.5 2.5 2.2 2.0 320
2537 SK420 24.0 3.3 3.0 2.6 420
2538 SK520 28.4 4.1 3.7 3.2 520
2539 SK600 34.4 4.8 4.2 3.7 600
2540 SK740 41.8 5.9 5.2 4.6 740
2541 SK830 46.1 6.6 5.9 5.1 830
2542 SK1000 57.5 8.0 7.1 6.2 1000
2543 SK1200 68.9 9.6 8.5 7.5 1200
2544 SK1500 83.2 12.0 10.7 9.3 1500
2545 SK1700 100.4 13.6 12.1 10.6 1700
2546 SK2200 122.7 17.6 15.7 13.7 2200
2547 SK2600 149.6 20.8 18.5 16.2 2600

Before commencing the entire sub-floor should be swept clean and free from any sharp objects. If laying onto foil backed insulation, ensure the area is dust free to enable a good fix.

It is good practice to plan your installation using a sketch marking your laying pattern and planning the positions for the floor sensor, the connection box and thermostat.

Attach the Screed-Fix band to the sub-floor or insulation using fixing nails or high impact adhesive tape. The Screed-Fix bands should be spread evenly across the floor at intervals of 750mm. A 75mm border should be left around the perimeter of the room. Do not remove the cable from the drum before laying as it will twist an make the installation difficult.

The heating cables must not touch each other and should never cross. The heating cable must not be cut or shortened and the joint between the cold tail and the heating cable must not be bent or put under strain.

The floor sensor for the thermostat should be positioned between 2 heating cables approximately 500mm from the wall. The black flexible conduit provided should always be used to install the floor sensor probe. Once laid the heating cable should be covered with a minimum of 50mm sand and cement screed.

Before and after covering the heating cable with the screed, the cable resistance should be checked against the label value. Avoid traffic over the areas until the cable is completely protected. The screed should be allowed to dry completely before turning on the system. Please check screed manufacturers instructions.

A fully qualified electrician must now make the final connections to the mains supply and install the thermostat. The thermostat should be installed in the room to be heated. In bathrooms, the thermostat must be located outside Zones 1 & 2. Finally the electrician should check for continuity of the floor sensor and retest the resistance of the cable. A further insulation test should be carried out in accordance with IEE regulations.


The installation should be protected by a 30mA RCD for safe operation.