3mm Heating Cable

A great value solution for use under tiles
constructed with a 3mm cable.

Category: 3mm Heating Cable
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Flexible, ultra-thin, universal 3mm underfloor heating cable

A flexible simple to fit heating system designed to provide energy efficient floor warming or a full heating system as desired. This electric underfloor heating cable is particularly suited to small or complicated areas where heating mats can be more complicated to install.

The systems output is varied by altering the spacing of the heating cable, allowing 200W/m² to be installed in conservatories and similar high heat loss areas. An additional benefit of this system is that it can be used beneath virtually any floor covering if covered with a levelling compound and installed with an output of no more than 160W/m².
Heat Mat Advanced Cable Design

  • When installed at 200W/m² this system is suitable for providing a full room heating system, even in high heat loss areas such as conservatories
  • Perfect for floor warming or room heating in standard rooms when installed at 160W/m²
  • Alter the heat output to match your individual requirements - outputs from 80W/m² to 230W/m² are possible
  • When used with Heat Mat's intelligent thermostat timers this heating cable provides a more energy efficient and cost effective heating system than lower powered alternatives
  • Particularly economic to purchase, and can be installed onto thermal insulation boards to provide a faster reacting and more economic heating system
  • Significantly quicker to install than some alternative systems as there is no need to cover the entire heating cable with masking tape due to its high strength outer insulation


Under Tile Bathroom Heating Cable

Underfloor heating cable systems react faster and are more energy efficient when used with an intelligent thermostat timer and are laid onto thermal insulation boards. 

Selecting the correct heating cables

To start with you will need to decide on the heat output of your heating system. For floor warming or room heating in well insulated areas we suggest installing the cable at roughly 150W/m², and for high heat loss areas, or for a faster reacting system, we recommend choosing a 200W/m² output. Once you have chosen your desired output you should measure your room to find the total floor area. You should then subtract from this figure any areas where kitchen or bathroom furniture will be placed, or where furniture without an air gap underneath it will be positioned. Once you have subtracted these areas you have your free floor area (FFA). If you multiply the FFA by the Wattage output you have chosen you will have the total output of heating cable you require, and you should then choose the most suitable combination of heating cables from the front of this sheet to provide you with the closest combined Wattage to your required output.

Combining multiple units

Undertile heating cables are designed to be laid together with other heating cables to ensure the perfect floor coverage. The cables are wired into the thermostat or junction box in parallel, and heating cables can be used to 'fill in the gaps' in a heating mat system, as long as they are laid at the same output as the mats.

Flexible and quick installation

Heat Mat electric undertile heating cables are incredibly simple to install, and in small or complicated areas can be significantly quicker to install than heating mats. The cable spacing can be altered to match your exact heat output requirements, and the system is fixed to the floor with the supplied high strength double-sided tape before tiling on top.

Sub-floor surfaces and insulation board

For the most energy efficient system and the fastest warm up time we recommend laying heating cables onto Heat Mat thermal insulation board. Heating cables can also be laid onto pre-primed concrete, tile or stone surfaces or suitably secured ply board.

Suitable for nearly any floor covering

If you are unsure of the final floor covering, the heating cables can be laid at an output of up to 160W/m² and covered with flexible levelling compound. This allows nearly any floor covering to be laid on top including tiles, stone, carpet,laminate, solid wood, Karndean and vinyl.

Approved and guaranteed

Heat Mat's electric underfloor heating cables are independently BEAB and Semko approved, manufactured in Denmark in our BEAB approved factory, and supplied with a Lifetime Warranty. They are also certified by Semko as having a very low EMC radiation, which is a result of their twin conductor design and 100% aluminium earth shield.

Heating Cable Technology

Over the last three decades Heat Mat have worked to continuously improved the design of their cables and mats to ensure their safety and longevity. This unique combination of technologies means you get a safe and fast to install system without sacrificing quality. Only Heat Mat’s systems include this combination of technologies:

  • Litzer Wire Technology – multiple heating elements are spun together to provide superior strength in a very flexible heating wire
  • 200°C Fluoropolymer Protection – super-high temperature fluoropolymer insulation surrounds the heating elements and provides superior protection against overheating and physical damage
  • Kevlar Anti-stretch Cable – Kevlar strands run through the centre of the heating cable preventing it from being stretched and damaged during installation
  • 100% Earth Shield – an aluminium safety shield wraps the entire heating cable to ensure the system is instantly shut down if damaged. The shield also enables the cables to hold their shape when being installed
  • Anti-crush Cable Jacket – the high quality PVC cable jacket provides unrivalled protection against crushing and cutting damage during installation
  • 100% Shielded Coldtail – the entire coldtail is shielded continuing the 100% electrical protection seen on our heating cable


Technical Data

  • General Construction: Dual conductor wire with earth
  • Supply Voltage: 240V
  • Output range: 130W–2406W
  • Maximum Load: 15W/m
  • Standard Range: 9.2m–171.0m
  • Coverage at 150W: 0.9m²–16.0m²
  • Coverage at 200W: 0.6m²–12.0m²
  • Maximum Cable Temperature: 90°C
  • Approvals: CE Marked and BEAB system approved
  • Wire Thickness: 2.7mm to 3.2mm depending on Ohm Value
  • Cable Flexibility: Minimum allowable cable radius is 18mm
  • Approved in accordance with: EN 60335-1:1998, EN60335-2-17:1999, IEC 60730
  • IP Rating: IPX7 as required by the 18th Edition IEE Wiring Regulations
  • Compliant with: Part L, 18th Edition IEE Wiring Regulations, EN 60335-1:1998, EN60335-2-17:1999, IEC60730


  • Thermal Conductor: 2 x resistance wire insulated with fluoropolymer (FEP 7Y) tested to 200°C
  • Outer Insulation: PVC (Y) tested to 90°C
  • Earth Protection: 100% aluminium earth shield
  • Reinforcement Materials: Fibreglass strands
  • Reinforcement Mesh: Fibreglass mesh
  • Fixing Material: Supplied with double-sided tape
  • Coldtail lead: 2m double insulated cable


Heating cables must always be controlled by a suitable electric underfloor heating thermostat with floor temperature limitation. Heat Mat thermostats are rated to 16 Amps, and if a system exceeds this loading a suitably rated contactor should be used. The circuit must be protected by a 30mA RCD and suitably rated fuse or circuit breaker.

3mm Heating Cable 14 W/m Technical Specification

Product Code Length (m) Resistance () Wattage (W) Coverage at 200 W/m² Coverage at 150 W/m² TSI Code
PKC-3.0-0130 9.2 442 130 0.6 0.9 389519746
PKC-3.0-0212 15.0 272 212 1.0 1.4 389519791
PKC-3.0-0316 23.0 182 316 1.6 2.1 389519814
PKC-3.0-0407 30.0 142 407 2.0 2.7 389520256
PKC-3.0-0518 37.0 111 518 2.6 3.4 389520269
PKC-3.0-0577 41.0 100 577 2.9 3.8 389520298
PKC-3.0-0719 51.0 80 719 3.6 4.8 389520311
PKC-3.0-0855 61.0 67 855 4.2 5.7 389520324
PKC-3.0-1086 78.0 53 1086 5.4 7.2 389520382
PKC-3.0-1207 86.0 48 1207 6.0 8.0 389520395
PKC-3.0-1350 97.0 43 1350 6.8 9.0 389520405
PKC-3.0-1507 108.0 38 1507 7.6 10.0 389520418
PKC-3.0-1772 128.0 33 1772 8.9 11.8 389520421
PKC-3.0-1983 141.0 29 1983 9.9 13.2 389520528
PKC-3.0-2250 160.0 26 2250 11.2 15.0 389520531
PKC-3.0-2406 171.0 24 2406 12.0 16.0 389520544


Electric Under Floor Heating Cable For Kitchens