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Cable Installation Guide

Note: For guide purposes only; use manufacturers instructions (supplied) when installing.

click here if you wish to download manufacturers instructions

From 1st January 2005 Installations must comply with Part P Electrical Safety regulations click here for details.

Ecofloor cables are manufactured from double insulated 3mm twin core heating cable, surrounded by a braided earth screen to allow installation into wet areas.

Measuring up

It is extremely important to measure area correctly;
re check your measurements before attempting to fit the cable.
If the cable has been taken off the reel and it does not fit we will not accept it as a return.

Measure the room; avoiding all permanent fixtures e.g. showers, baths, fixed units etc., this is important to avoid causing possible damage to the floor due to 'thermal blocking'; this is when the heat cannot radiate from that part of the floor because it is being blocked by a solid object e.g. a kitchen unit which results in localised heat build up.

Once you have calculated the total area to cover; reduce this figure by 5% to allow for the perimeter clearance.

Output Requirements

Apart from timber floors where 100 W/m output is recommended, install the optimum heat level possible for the available floor area.

Different heat levels can be achieved by varying the cable spacing:
160 W/m for optimum output use 70mm spacing
130 W/m for comfort heating use 90mm spacing and
100 W/m for background heating use 110mm spacing (Recommended for timber floors).

Greater areas can be achieved by laying individual cables; in any configuration and connecting them in parallel.

If in any doubt contact Discount Floor Heating for advice.


This example shows a room with units that are to be permanently fixed in place (e.g. a kitchen).

The floor size is: 5m x 4.5m; a total area of 22.5m. Now deduct the area covered by units:-

kitchen units 1m x 4.5m + work unit 1.5m X 2m + corner unit(.4m x .6m)/2 = 4.5m + 3m + .12m which is a total of 7.62m reducing the available area to 14.88m, a further 5% must be taken off to allow for perimeter clearance; giving a total heated area of 14.13m. Select the nearest rounded down cable/s:
8.1m (EK10-1300) + 5.9m (EK10-950).

As Ecofloor  cable is a twin conductor heating cable; connection to the electricity supply is at one end only. In this example more than one cable is required to make up the area to be covered; these are connected in parallel as shown.

The thermostat sensor must be positioned centrally between cable loops as shown.

Cable Installation Guide by Discount Floor Heating


It is advised to use insulation to avoid heat loss to the sub floor; resulting in poor floor heating performance.

Fix the insulation to the floor using a flexible tile adhesive applied with a fine depth tiling trowel, lay the boards so that where possible the joints are staggered.


The location of the thermostat is your choice but it makes sense to locate it as near to the electricity supply as possible and is normally in the room being heated. Note for wet areas (e.g. bathroom) it must be outside of the room.

Connect via a fused spur or use a dedicated supply with its own RCD (consult your electrician). The thermostat sensor must be positioned between cable loops so measure where this will be and cut a channel approximately 10mm x 10mm deep and 300mm long in the insulation to locate the flexible floor probe conduit in.

The thermostat is rated at 16amps and will control a maximum heated area of 3680 watts.

Underfloor Heating Cable Installation Guide by Discount Floor Heating

Laying Cable

The black connecting wire can be cut as required once you have established that you have enough to reach your supply, however never cut the orange heating under any circumstances.


You must leave a minimum of a 50mm gap from the walls and any other fixed object.

You must never have the cable closer than 70mm to the next cable and cables must never cross over each other.

Before you take any cable off the roll make sure that you have ordered the correct size as it can only be exchanged if the kit is still intact.

After laying the cable you can use an ohm meter to test the circuit; the resistance should be as shown on the sizing guide in the manufacturers installation instructions.

Avoid excessive traffic over the cable prior to applying the floor covering.

The final connection should be carried out by a qualified electrician.

Floor covering

The use of suitable protection boards will prevent any possible damage during floor covering.


Chipboard floor; fasten the board at 300mm centres.

Wood floor boards; cover with 15mm ply, fix at 300mm centres.

If the chipboard or ply has not been treated then apply a suitable primer.

Use a good quality flexible tile adhesive to fix tiles in either a single or double layer operation to accommodate the 3mm cable thickness.

You must use a plastic notched trowel to avoid damage to the cable and cables must be fully encapsulated by the adhesive; leaving no air spaces.


Use EcoFilmSet


It is highly recommended that you connect your system via a fused spur (to isolate the system for future maintenance) and/or a safety contact breaker (RCD); an electrician will be able to advise you.

The electrician should affix a suitable advisory warning notice on the electricity distribution box and complete the attached certificate which must be retained to serve as part of the guarantee requirement.

Switching on

Allow at least 3 days for the adhesives to dry naturally before powering up your underfloor heating

Before switching on the underfloor heating allow a minimum of 3 days for natural drying of the tile adhesive and grout. It is recommended that you gradually increase the operating time of the system over the first week from 1 hour, increasing by a further 1 hour per day to full continuous use.

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