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Project Guide Notes & 150 or 200w/m² under tile mat heating systems

Please read the notes below in conjunction with your plans for underfloor heating. These should be checked before an order is placed. 

Electric underfloor heating is now an essential addition to any room in the house where ceramic, porcelain or natural stone tiles are being fitted. Not only does it add the feel of luxury to a room, it is also an extremely efficient alternative to conventional heating systems and provides even heat distribution across the whole area.

The 150w/m² FLOORHEATPRO underfloor heating mat is suitable for under tile heating in bathrooms, kitchens and most living areas within the home. When the floor and room are well insulated the 150w/m² system can also be used for your primary heat source.

The 200w/m² FLOORHEATPRO underfloor heating mat is the highest power rating available and this is suitable for under tile heating and is recommended for conservatories, primary heat source applications and to heat rooms having a higher heat loss. Also, it is used where a faster heat up time is preferred; up to 25% faster warm up than a 150w/m² system.

On concrete floors and depending on floor height restrictions, always attempt to install a thermal barrier of floor insulation just under the heating to gain maximum efficiency.

The heating cable used for the under tile heating mats is the same as used in the loose cable system, and has a rating of 10w/m. Loose cable is chosen in preference to a mat when the floor area is smaller and awkwardly shaped like in some bathrooms and shower rooms. Both the loose cable and mat under tile heating systems are 100% safe for use in wetrooms and bathrooms. Underfloor heating in wet areas will also dry the floor and provide a more hygienic environment.

If you are heating a floor to be covered with Amtico or Karndean the maximum power output to use is 150w/m². Please refer to our guide specifically for heating under Amtico and Karndean flooring.

150w/m² mats: The largest single mat size is 12m² but in larger areas you can combine more than one mat to cover the floor area to be heated. A thermostat is normally rated at 16A (amps) and this is suitable to switch up to 3600 watts direct. This means 24m² is the maximum heated floor coverage with a 150w/m² system that can be controlled direct through a thermostat . However, it is still possible to heat a larger area than 24m² with a single thermostat, but in order to switch the amperage a contactor will be required as well as the thermostat. Alternatively, in larger areas the heating can be split into more than one heating zone, each zone with its own thermostat.

200w/m² mats: The largest single mat size is 12m² but in larger areas you can combine more than one mat to cover the floor area to be heated. A thermostat is normally rated at 16A (amps) and this is suitable to switch up to 3600 watts direct. This means 18m² is the maximum heated floor coverage with a 200w/m² system that can be controlled direct through a thermostat . However, it is still possible to heat a larger area than 18m² with a single thermostat, but in order to switch the amperage a contactor will be required as well as the thermostat. Alternatively, in larger areas the heating can be split into more than one heating zone, each zone with its own thermostat.

FLOOR SIZES

ENQUIRIES & QUOTATIONS - When room sizes or floor areas are given in your enquiry these will be reduced by 10% to allow for fitting of the heating system proposed. If you have already made allowances for this in your sizes given please confirm as a re-quote may be necessary.

FREE FLOOR AREA DEFINED

Our proposals are always based on a heating system to fit the free floor area. The free floor area is the total area of the room less any permanent footprints such as units, islands, baths, showers etc. If any footprints have not been allowed please confirm immediately as a re-quote may be necessary.

FLOOR INSULATION

On concrete floors the option is available to install insulation board directly below the heating. This will provide a thermal barrier to increase efficiency and maximise temperature response. Insulation boards must be secured to concrete floors with flexible tile adhesive. Please note the heating will always be designed to cover the free floor area available to heat. This area will be less than the total floor area of the room. When estimating the number of insulation boards required you should consider the total area of the room to ensure the floor level is consistent all over

FLOORS & ** FLOOR PRIMING **

All floors should be clean, level and rigid / firm. All floors to be tiled must be sealed / primed before installing the heating system to ensure a bond with adhesives and levelling compounds. ** As standard, our kits are supplied with a good quality primer for this purpose **

HEATING CABLES

At all times heating cables should be fully encapsulated within the tile adhesive or levelling compound.

LAMINATE, ENGINEERED WOOD, VINYL, KARNDEAN & CARPET

When using any of the above floor coverings a maximum 150w/m² heating system MUST be covered with a 12mm thickness of flexible levelling compound prior to laying the floor covering. If you have a floating floor (laminate or engineered wood) less than 18mm thick, our foil heating mat system RFLAM can be used which is a dry system. 

SYSTEMS (mat or loose cable) RATED AT 200w/m² ON A WOODEN SUB-FLOOR

When using a 200w/m² heating system directly onto a timber sub-floor always ensure the floor is level and rigid before applying a 2-3mm layer of flexible tile adhesive evenly over the floor prior to laying the heating system. Alternatively, tilebacker board can be screwed to the timber floor, which will insulate the floor as well as strengthening the floor.

THERMOSTATS

To save energy we recommend each room should have its own controller. This allows each room to have settings at different temperatures or time and will avoid heating rooms when it is unnecessary. Thermostats are rated at a maximum of 16 amps to operate a maximum of 3,600 watts direct with a single thermostat. Systems exceeding this maximum with a single thermostat will require a contactor (please discuss with your electrician for advice)

PRIMARY HEATING

When primary heating is the requirement a layer of insulation board should be installed directly below the heating prior to laying the heating system.

INSTALLATION INSTRUCTIONS

User friendly installation instructions ensure the installer has the information required to complete a satisfactory installation compliant with the Regulations

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