Most common issues can be answered by the questions below.
Our technical staff are fully qualified electricians and plumbers and can offer expert advice on any additional issues you may have.
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Electric Underfloor Heating
For example. If you have purchased a 200watt heating mat that is 10m2. The heating mat is 200watts per square metre, meaning the total power is 200 x 10 = 2000watts or 2kilowatt. Divide mains voltage into this and you end up with your Amps or current. 2000watts divided by 230volts = 8.69Amps.
Your electrician should use this information when working out what size supply to install for the heating mat. If in doubt contact our technical team for support.
Each heating mat size that we supply if a different cable with its own unique resistance per linear metre, a shorter heating mat will have a higher resistance as it will not need as much current to produce the same output.
Electric Under-tile Heating
Heating mats are the same cable as the loose cable kits (2mm loose heating cable rated @10/12 watts/m) already spaced out for you and attached to a fully adhesive mesh backing. Heating mats are typically easier to install in larger areas, whereas loose cables are more suited for smaller or awkward shaped rooms (i.e. bathrooms) Our heating mats come in 3 wattages:
200 watts per square meter
this is the most powerful type of heating mat. It can be used beneath tiled or stone floors and is recommended for high heat loss areas such as conservatories. It should also be used where laying onto a concrete floor when not using insulation boards. The maximum area you can connect to 1 thermostat is 18m2
150 watts per square meter
this is a mid-range powered mat, our most popular, which is suitable for most applications and can be used as a primary source of heating beneath most floor finishes. It should be noted that finishes such as Karndean or Amtico have a maximum of 150w per meter. The maximum area you can connect to 1 thermostat is 24m2
100 watts per square meter
This is the lowest powered mat which is suitable for taking the chill off cold tiles – it is not suitable for a primary heating source. The maximum area you can connect to 1 thermostat is 36m2 Heating mats are for use on a finished subfloor such as concrete screed or plywood and we recommend they are encased in either a flexible tile adhesive (if laying tiles) or a flexible levelling compound if laying any other floor finish.
Underwood Foil heating mat:
This underwood foil heating mat is designed for use underneath laminate or engineered wood floor finishes without the need for adhesive of levelling compound. It must be used in conjunction with Profoam or XP-Pro insulation boards, but once fitted the laminate or engineered wood can be installed directly on top! This system can also be used under carpet or vinyl BUT in this case it must also be used with Heat Pak Dual Overlay.
The loose heating cable is rated at 10 watts per linear meter and is the same cable used in the heating mats. The cable comes on a drum and spacing must be manually measured (full instructions on how to do this are included in the kit).
In Screed Heating Cable:
Must be encased in the finishing screed of the concrete floor (usually a minimum of 65mm as per Building regulations) with a minimum of 20mm of the screed above the cable. The same maximum outputs are recommended for the in-screed cable, that is, up to 200watts/sqm beneath tiles / stone and 160 watts/sqm beneath all other floor finishes.
Under Tiles / stone floors - up to 200w per meter
Under carpet or lino - maximum of 150w per meter
The system always works best if used with suitable insulation boards as this prevents the heat from going downwards and ensures it travels up. We understand that not everyone has the floor height to install a board so in this case you could use Fast heat thermal primer, which does not raise the height at all. (however this is not as effective as insulation boards)