Heated driveway?

Commercial snow melting. (E.g. TOYOTA + ELEKTRA).


ONDOL - The Korean invention

American Legend: Architect Frank Lloyd Wright

From STONE COLD to NICE WARM floors in just 2 hours?

New Kitchen Project. (Part 1)

New Kitchen Project. (Part 2)

Radiant heating in one day?

From cold slab floor to comfort and beauty.

How to connect UCCG-9991 programmable thermostat for radiant floor heating?

How to connect MTC-2991 manual thermostat for radiant floor heating?

How to choose the in-floor radiant heat ELEKTRA mat?

Many components of the Great Real Estate. (Part 1).

Many components of the Great Real Estate. (Part 2).

How to connect more than 1 mat?

The problem on the roof

Installing radiant floor heating in just one afternoon.

Cathedral ceilings effect & Medieval Hypocaustum (floor heating)


Where to begin

How to choose the right floor heating product for the application.

Suitable for new construction or remodeling applications, electric floor warming systems include a network of cables sewn into strong fiberglass mesh 20" wide and of various lengths installed in the mortar just below the tiles.




The larger the coverage and longer the mat - the more powerful (more Watts) it is.
Double insulated and grounded cables gently warm the tiles, operating on ordinary house current.
While using a professional electrician is advised for those not comfortable working on electrical installations, these systems are generally easy to install and will not compromise the integrity of the tile installation.


ELEKTRA heating mats are ready to be installed out of the box, but it should be noted that a fair amount of planning and some preparatory work is necessary.


Designing and then as a result of good planning consequently installing a floor warming system can be done at the same time when planning and preparation for new floor installation is done. 


  • *         First, take a good look of the area to be warmed. 
    Calculating the total square footage will require collecting information from the blueprints of the room or actually measuring the actual area itself. If possible - this usually is a better method.
    Note that areas that are inaccessible or under cabinets, vanities, shower stalls or plumbing fixtures should not be included - there's no need to heat floor area that won't be walked on or at least barefoot touched !
    When making the calculations it is advisable to design a layout that considers actual use and traffic patterns in the area to be warmed.


  • *         Once knowing the square footage to be warmed - decide if 9 Watts/ sq. ft. is enough or 14 Watts/sq. ft. will be better. Simply said - multiply the square footage to be warmed by 9, write down the answer and then multiply the same area by 14. Compare both numbers.  If one looks high go with the other. In general - for larger coverage such as over 70 sq. ft. 9 Watts/sq. ft. is usually enough. Floor heating in contrast to air heating or space heating where lot of heat is applied to small space and then hopefully blown all over is a little heat per square footage applied over large areas. 


"Know your limits". Tips. Re: 9W/sq.ft. vs. 14W/sq.ft.


For smaller coverage either one is good, depending on the climate zone and flooring type. E.g.:

For ceramic tiles 9 Watts per sq. ft. is OK.

For stone or slate go 14.


For larger areas remember about technical limitations of the power source.

1200 Watts powered by 120V AC will use 10 Amps current (1200W / 120V = 10 Amps). Look at the breaker on the electrical panel. Is it 15 A? That's your limit on that line providing that NOTHING ELSE besides your permanently wired floor heating gets connected there. 15A @120V means 1700W.

@ 230V - almost double that. 


The complete system consists of one or more mats and appropriate line-voltage thermostat, preferably equipped with floor temperature sensor.
In general, and aside from many available sizes, there are several versions of the mats and combinations thereof:


  • Powered on one end or both ends of the mat.
  • Powered by 120 or 240 Volts AC.
  • 9 Watts/sq.ft. (100W/m2) or 14 Watts/sq.ft. (160W/m2)


Double-side powered mats are thinner, but both cold tails (power supply cords) need to be connected to the power supply terminals at the dedicated line-voltage thermostat. Single side powered mats have only one such cord.
Although compatible with most line-voltage thermostats, it is highly advisable to use the thermostats with floor temperature sensing capabilities specifically manufactured for radiant floor heating. For the thermostat voltage, minimum and maximum power requirements have to agree with the mat (or set of mats).


How to choose suitable line voltage thermostat?


Air temperature sensing thermostat:

When heating of the room and the floor is to be considered the primary function of the system.


Floor temperature sensing thermostat:

Heating of the room is welcomed as a secondary result and therefore thermostats with a floor temperature sensing probe is of such importance.


ELEKTRA UCCG or MTC series thermostats:
UCCG offers built-in GFCI protection and programming functions. If the thermostat does not have GFCI protection it can, and often should be added.
Please check with your electrician. Adding GFCI to the setup with MTC thermostat - if needed - is usually a very simple and inexpensive upgrade.

A complete system often can be installed using an electric drill and other simple tools but please note that scissors are much better than the utility knife to cut the fiberglass mesh!

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New York International Tile and Stone Show
Is electric radiant floor heating ENERGY EFFICIENT?
Likely yes
Likely no
Don't know