PLEASE EXPLAIN
Heated driveway?

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

HYPOCAUST. Made in GREECE and ROME

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)

STEP-BY-STEP INSTALLATION




Single side powered vs. dual side powered ?? 120V vs. 240V?



Dual vs. single side powered in-floor heating mats? 120V vs. 240V? How big?


To choose which ELEKTRA mat to use for the radiant in-floor heating please measure the square footage of the 'walkable' floor area ONLY.

 

  • The floor is to be heated only where it is not covered completely by appliances, shower stalls, cabinets etc. This is a radically different approach from the situation when the floor covering such as tiles are chosen and ordered when 110-120% of the TOTAL square footage is needed because of cuts, fitting etc. The In-floor heating mat square footage needed will be as little as 40% to as much as 80% of the final floor covering material.

 

  • The next step after figuring out how much square footage is needed is to decide whether 9 Watts/sq.ft. mats are needed or 14Watts/sq.ft. are better. Both will do the job equally well, although 9 Watts/sq.ft. mats will take somewhat longer to reach preset temperature.

 

  • Finally, the total Amperage has to be calculated and based on this the voltage of the mat(s) chosen.  110-120V models cost the same and are laid out the same as 230-240V models. The mats are voltage specific.

 

E.g. 200 sq.ft. coverage @ 9Watts/sq.ft. = 1800Watts - usually too much for 120V power as this is 15 Amps. But 1800Watts/240V = ‘cool’ 7.5 Amps. only.

 

 

Please note how the MG heating wire of the mat is one continuous loop starting and ending in the same spot of the room (RH far corner), near where the thermostat is to be located on the wall.

 

The mat is laid out in a way that nothing is left over, no overlapping is permitted, no cutting OF THE HEATING ELEMENT  and the heating wire of the mat is never too close together. (1.5"-2" minimum separation is a must).


ELEKTRA MD or MG mats? An electrical device with two power cords?

 

Like almost everything electric, the mat has the power cord (often called "the cold lead wire"). In this case and since it is to be hardwired to the thermostat, without any electrical plug(s).
If it uses one power cord (usually white), (like your typical household appliance) then the mat (or the heating cable on the spool) is called single side powered.
This is to distinguish it from a much thinner, very slim 1/8" mat called dual side powered, which comes with 2 POWER CORDS! Here is how:
The reason for this is to make everything so thin that it will disappear into the mortar holding the tiles.
Connection is just as easy as a hardwired wall light! Each power cord is 10' long and can be extended by approved methods.

 

MG mat, with two cords:

 

The reason for this is to make everything so thin that it will disappear into the mortar holding the tiles.

Connection is just as easy as a hardwired wall light! Each power cord is 10' long and can be extended by approved methods.

 

vs.

 

MD mat with one cord:

 

MG mat                    vs.                MD mat

 

Either mat can be 9 Watts/sq.ft. or 14 Watts/sq.ft.

Either mat can be for 120Volts AC or 240Volts AC.


MG mat (2 power cords)                    MD mat (1 power cord)   (Largest mat: 133 sq.ft.)                   (Largest mat: 111 sq.ft.)

  


How the mat's heating cable is composed:

 

ELEKTRA MG mat heating cable

One heating wire powered at both ends. MG mats have two connecting cords. Sounds confusing? Connection is easier than it sounds. 

This is to show what's inside. The woven copper is the ground wire for protection and safety.

The heating wire is never to be cut like this.

 

ELEKTRA MD mat heating cable

Two heating wires powered at one end.

MD mats have one connecting cord.

This is to show what's inside. The woven copper is the ground wire for protection and safety.

The heating wire is never to be cut like this.



MG vs. MD?
Which one to choose? Either one is good. Both will do the job equally well and both will last a long, long time. MG is thinner and easier to be covered by thinset.  MD is a bit easier to connect. 
 
Often, the size of the coverage will help to determine what kind of the mats to use.
For example, pictured here are two MG100/12.0/240V mats covering 266 sq.ft. with some areas of the 290 sq.ft. room still not covered. If the ‘MD’ mats (single connecting wire) should be chosen, where the largest model is 111 sq.ft., then three smaller MD mats will be needed instead of two MG larger models, making the cost per sq.ft. higher and requiring more thinset.

 

 

 

 

Please note the excellent craftmanhip of this job. The quality shines! Congratulatons Dan & Shirley!

 


 

WHEN INSTALLING THE MAT(S):

 

  • DON'T CUT THE HEATING WIRE!
  • ONLY THE FIBERGLASS MESH CAN BE CUT, NEVER THE HEATING COIL!

 

 

MAINTAIN THE DISTANCE BETWEEN HEATING COILS! 

This is NOT OK:

 

1" IS THE ABSOLUTE MININUM. 2"-3" IS BEST.

 


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.




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