In slab electric underfloor heating is a very practical option for warming any kind of living area. In-slab heating can be used in all types of homes and it offers an excellent cost and energy efficient solution for large spaces. Read on below to find out more.


The in-slab heating cable is suitable for large areas where the slab is used for heat storage. In-slab heating has a slow response time and can take 10-24 hours to heat up, depending on slab thickness and insulation. Off- peak power can be utilised for in-slab heating.

Cable Technology

The in-slab cable is a flexible, double-insulated single cable system. a multi-strand heating cable provides superior strength to prevent cable failure due to slab movement.

Heat Output

The in-slab cable has a heat output of 160W per m² at 200mm spacing. It is available in factory terminated lengths ranging from 30m up to 170m. Comfort Heat staff will help select the correct cable length for your heated area with a 200mm clearance from walls and fixtures.


The in-slab cable is installed before the slab is poured. The cable is attached to either the mesh (i.e. F72) or the reinforcing rods installed at 200mm centres (one direction only).

Special Requirements

The cable cannot be installed across expansion joints. Comfort Heat must be informed of any expansion joints in the slab. For large areas, multiple cables will be installed.


Talk to Us about In Slab Electric Underfloor Heating

For more information about the latest modern floor heating, download our brochures. To discuss your options for in slab underfloor heating, call us or contact us online. We’ll be happy to provide any information, technical guidance, or services you require.

Please note: In slab underfloor heating requires site information and metrics. We’ll require information about your slab construction and measurements to provide you with technical support and a quote. 




Cable Type Single conductor heating cable with earth screen
Construction Multi-stranded heating wire with double insulation, earth screen and sheath
Insulation 4000 V
Rated Voltage 230 Volt AC; Rated output 30W/m
Cold Tail Length 3.5 metre with splice connection
Cable Diam. 5mm
Cable Standard IEC800 Class II
Warranty 10 years