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click-here2.gif  Cable & Mat Floor Warming Systems Installation Instruction Download
click-here2.gif  OJ Electronics Wi-Fi GFCI Protected Touch Screen Thermostat Model UWG4-4999 Installation Instruction Download
click-here2.gif Aube by Honeywell Non-GFCI Thermostat Model TH115-AF-120S & TH115-AF-240S Installation Instruction Download

Aube by Honeywell GFCI Protected Thermostat Model TH115-AF-GA Instruction Download

click-here2.gif OJ Electronics GFCI Protected Touch Screen Thermostat Model UDG4-4999 Installation Instruction Download
click-here2.gif How To Install Cable Floor Heating System Using Prodeso Cable Membrane
click-here2.gif Cerazorb Synthetic Cork Underlayment Instructions
click-here2.gif Circuit Tester Installation Monitor Instructions

           Tips for a Successful Installation

  • Never cut or overlap the red heating wires
  • Confirm the ohm resistance between the black and white cold lead wires is correct throughout the installation
  • Embed system in a polymer modified cement based mortar
  • If installing on a concrete slab we recommend using some type of insulation to avoid heat loss through the concrete such as Cerazorb synthetic cork 
  • Keep heating wire 6”-8” away from wax ring of toilet
  • HEATING CABLES: When using cables with Schluter-DITRA-HEAT or Prodeso Heat Membrane Systemspace wires alternating 3 pegs/2 pegs for an average of 3” spacing.


  • Floor Sensing Thermostat (available for purchase with floor heating system)
  • UL Listed electrical box 4x4 with single gang "mud ring" cover
  • Flexible or rigid UL Listed conduit
  • 12-guage or 14-guage electrical wiring, consult electrical code
  • Wire nuts (included with thermostat purchase)

The Installation Monitor included with your purchase screams a warning if the heating element is cut or damaged during installation.

The floor heating system needs to be GFCI Protected.  You can do this one of three ways.
1.  Use a GFCI protected circuit breaker
2.  Have the system tapped off the protected side of a GFCI outlet
3.  Use a thermostat with the GFCI built into it

When installing on a concrete slab we recommend using some type of insulation to avoid heat loss through the concrete such as Cerazorb synthetic cork underlayment https://www.warmingsystems.com/cerazorb-thermal-break-underlayment-2-x-4-use-when-installing-on-concrete-slab/.


  1. Test the floor heating system.
  2. Check Thermostat and Electrical Requirements making sure the 10' cold lead(s) at the end of the system reach the thermostat.
  3. Unspool the cable, spacing it 3" apart on the floor and securing it with the included cable guides.  Unroll the mat and use the mat turn techniques provided in the installation manual to properly cover the area you want to heat.  Use double- sided tape on mat to hold it in place.
  4. Connect the power leads and thermostat sensor to the thermostat.  The sensor wire should be located in between two heating elements, at least 6" from the edge of the heated area.
  5. The heating system must be embedded in 1/4" to 1/2" thick polymer modified cement based mortar.  The heating system should be installed on concrete or concrete backer board. 
  6. Install Floor Covering
  7. Terminate all electrical connections.

Circuit Breakers and Supply Wire (always follow local codes for wire gauge size)
Mats or Wire              Supply Wire       Breaker                                     
VAC    Total Sq. Ft.        (AWG)           Qty      Type            Rating          
120    up to 120 sq. ft.     14                1        single pole   15 or 20 A     
120    up to 150 sq. ft.     12                1        single pole   20 A             
240    up to 240 sq. ft.     14                1        double pole  15 or 20 A    
240    up to 300 sq. ft.     12                1        double pole  20 A             

 Frequently Asked Installation Questions:

What kind of mortar should I use? 
 Use a polymer modified cement based mortar.

Is there anything I should consider when installing on a concrete slab?
Yes.  We recommend using some type of insualtion to avoid heat loss through the concrete.  We sell a synthetic cork underlayment called Cerazorb that does this https://www.warmingsystems.com/cerazorb-thermal-break-underlayment-2-x-4/.

How close to the wall should I put the heating system?
We recommend installing 4" from the wall since the heat radiates no more that 2" in either direction from the cable.

Is the thermostat GFCI protected?
The aube thermostat (TH-115-AF-120S or TH115-AF-240S)) that comes standard and is the default thermostat option is not GFCI protected. If you use this thermostat you need to have a GFCI protected circuit breaker. You can purchase the aube by Honeywell GFCI  protected thermostat ,  OJ Electronics GFCI protected Touch Screen thermostat, or OJ Electronics GFCI protected Touch Screen WiFi thermostat for an additional charge.

What size electrical box should I use?
4" square electrical box with a single gang mud ring that's located within reach of the 10' cold lead.

Can I install your product outdoors?
No. The electric floor warming systems manufactured by Warming Systems Inc. are designed for interior floor applications, supplying 12 watts/square foot. They cannot be used for exterior snow melt or ceiling heating applications.