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)


How to install indoor floor heating cable

How to install indoor floor heating cable without mistakes.

There are 2 basic types of floor heating cables:


  • VCD - One end of the cable is to be connected to the thermostat and the other end is capped.


  • VC - Both ends of the cable are to be connected to the thermostat


Some cables are 'more powerful', some are 'weaker'.

The designation here is by the Watts per running unit of length of the cable.



VCD10/550 cable is 550W/240V cable powered on one end and 'weak' 10Watts/run. meter or 3.1 Watts/run. ft.


VC20/2920 is 2920W/240V cable powered at both ends and 20W/run. m. or 6.25W/run. ft. 


All of the designations of Watts per running unit are:


(Mostly indoors)

10 Watts/run. meter or 3.1 Watts/run. ft. (both VC & VCD)

15 Watts/run. meter or 4.7 Watts/run. ft. (VC only)

17 Watts/run. meter or 5.3 Watts/run. ft. (VCD only)


(Mosty outdoors)

20 Watts/run. meter or 6.25 Watts/run. ft (VC only)

25 Watts/run. meter or 7.8 Watts/run. ft. (VCD only)


Which one to use?

VCD cables are thicker (as thick as your cable TV wire) because they have 2 heating cores.


VC cables are thinner as they have only one heating core. About half the size of VCD thickness.

The thicker the mud job (self leveler, mortar or thickset) the more powerful cable can be used.


VC10 or VCD10 - 1/2" or thicker of the mud job.

VC15 or VCD17  - 3/4" or thicker of the mud job.

How to install it?


Tools needed:

1. Cable tacker

2. Measuring tape

3. Calculator

4. Electric meter


Heating cable cannot be cut to size. It is what it is and over 180 models are available based on length and Wattage.

Heating cables cannot cross or be closer than 2"!




1. Measure the square footage of the room. DON'T ESTIMATE, measure exactly what the square footage is.

WALKING AREA ONLY. Not under permanent fixtures, shower stalls, cabinets etc.

Tip: when measuring the floor leave some 5-6" off the wall not covered. You could use this area as a "buffer zone" to install the cable in later in case you will have some cable "leftover" at the end. Remember, it cannot be cut and everything must be used up.


Plan for anywhere between 9-15 Watts/s.f.

E.g. 193 s.f. ?

VCD10/1900 a 1900 Watts 240V cable is good for 1/2"-3/4" floor mud job.

This particular cable is 617 ft. long.

For thicker floor VC15/1900 or VCD17/1920 are good. 

Any of the above cables will produce 10 Watts/s.f.


2. After receiving the cable check the resistance or continuity of the heating element with the meter.



3. Plan for the spot for flex conduit (included) for the thermostat floor temperature sensor installation. 2-3" away from actual heating element is good.



4. How to calculate the distance between each run of the cable?

Convert 193 s.f. into square inches.

E.g. 193 s.f. x 12 x 12 = 27765 sq. inches.

Convert the length of the cable

E.g. 617 ft. = 7404 in. long.

Divide 27765/7404 = 3.75 in. or 3 3/4" apart 




Feedback is something that really keeps us going.

Please comment on the FORUM or send us your comments or requests for any specific topic that you would like us to feature.

Learn More

  If you have a store - we have a story. For real.
Read More
  Smart remodelling will increase the value of your home.
Read More
  5 basic facts to know when choosing ELEKTRA heating cables.
Read More
  The cost of running your floor as a energy efficient heater.
Read More
  New York International Tile and Stone Show
Read More
  A carry-over from the ancient past? 1000 year old technology?
Read More
  IBM - PL. Why no driveway or steps will need to be shoveled or salted when winter arrives.
Read More
  We almost lost the count where all those ELEKTRA heated floors are!
Read More
  Smart remodelling will increase the value of your home.
Read More

No Items

IBM - PL. Why no driveway or steps will need to be shoveled or salted when winter arrives.
Is electric radiant floor heating ENERGY EFFICIENT?
Likely yes
Likely no
Don't know