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Underfloor Heating - How to select

The Underfloor Heating System you choose will be dictated by your circumstances. Renovators will be concerned about floor height, so a super thin cable will make installation over an existing floor easy and also eliminate the need for a screed or levelling compound. Builders with new constructions, using a screed, may prefer the traditional in-screed heating system because the 6.5mm cables are protected and buried and height is of little concern.

First measure your floor area (remember to deduct the area of any fixed objects, i.e. kitchen units etc.) to establish the area to be heated in m2.

Safe-t-WIRE Heating Cable: Under Tile / Floor Radiant Heating

Safe-t-WIRE Heating Cable: Under Tile / Floor Radiant Heating

Secondly you need to select the type of heating required, e.g. "Living Areas, Bathroom Areas or In-Slab".

For living rooms, bedrooms, hallways, open plan rooms 125 W/m2 is recommended for comfortable heating levels where the system heats the tiles and the room. Simply multiply the floor area to be heated by 125, this will give you the cable size in wattage required, then select from the "Living Areas" section on the Underfloor Heating pricing page.

For ensuites, bathrooms or laundries, due to the floor area being small relative to the room volume a higher wattage of 160 - 180 W/m2 is recommended. Simply multiply the floor area to be heated by 160 this will give you the cable size in wattage required, then select from the "Bathroom Area" section on the Underfloor Heating pricing page.

Safe-t-WIRE underfloor heating cable in an under-tile installation

Safe-t-WIRE underfloor heating cable in an under-tile installation

Remember you can always run a larger system at a lower setting but not the other way round, if in doubt then choose the next sized cable up and run it at a lower setting, it will give a better output and run more efficiently.

For in-slab heating our Safe-t-SLAB cables are engineered to allow the spacing of the cable to match the reinforcement steel spacing (200 mm). This system is designed to take advantage of off-peak electricity rates at night and return the stored heat during the day. For more information on this please visit the in-slab Heating page.

Single or Twin Conductor Cable: The convenience of a twin conductor, means you can lay the cable without having to bring the other end back to the supply circuit simply because, this type of cable only has a single cold tail. This makes life easier and speeds up your installation process, particularly when using the Safe-t-SCREED or Safe-t-SLAB cables.

Screened Cables: Normally used in "wet areas". Our ultra-thin (UT) and in-screed bathroom cables have a teflon coated coaxial plaited screen for your safety and protection. 30 mA Earth Leakage Circuit Breakers (ELCB) or Residual Current Device (RCD) also protects circuits.

You might also like to check our range of new-technology high-efficiency radient floor heating systems using Safe-t-FLEX heating film as this may be more suitable for your application of underfloor heating.