WarmWire · 200 Square Foot Radiant Floor Heating Cable (240V)

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WarmWire is an affordable alternative to floor heating mats.

The constant diameter of the radiant heating cable allows uncoupling into the membrane quick and easy!

  • Compatible for install into CableStrap or Floor Membrane at 2 ½, 3, or 3 ½ inch spacing
  • Total design freedom allows for installation around turns & obstructions such as a toilet  or kitchen island
  • Covered by a 25-year manufacturer warranty whether installed with CableStrap or another manufacturers’ membranes
  • Approved for shower installation where permitted by the local authority having jurisdiction (AHJ)

WarmWire works wonderfully under natural stone, tile, laminate, engineered woods, carpet, vinyl, linoleum, & solid hardwood (if you use sleepers).

Instruction Manual Link

WarmWire Cable Installation Manual


Install Steps

Step 1:

Plan your layout and determine the cable direction. Measure

about 3" in. inches from the wall, and place strap parallel to

the wall. Under toe kick spaces, install the strap 1.5"in. inches

to 2" in. inches away from the vanity.


Step 2:

Cut the strap to length for each side of area

to be heated. 




Step 3:

Secure the strap to the subfloor using double-sided

tape, glue, or fasteners.





Step 4:

Fill in each section back and forth with cable,

spacing the wire 2.5" or 3" in. inches

apart. For additional areas, cut and attach the

straps accordingly and begin weaving the 

wire into that area.




If cables are running greater than 3' or 4'ft. feet across a room, be sure to add another

strap to thread through in the center of the area to be heated.

Shower Installation

Yes, can be installed in a tiled shower. UL listed, verify local code.

Indoor / Outdoor

INTERIOR floor heating application only. Embedded in mortar or self leveler only

Power Supply & Wiring

Mats or WireSupply WireBreaker
VACtotal amps(AWG*)qtytyperating
120up to 12 amps141single pole15 or 20 A
120up to 15 amps121single pole
20 A
240up to 12 amps141double pole15 or 20 A
240up to 15 amps121double pole20 A

* Recommended only. Follow local codes for wire gauge size.

Maximum Circuit Load

15 Amps

Maximum Circuit Overload Protection

20 A Breaker.

Wire Construction

Blue Flexible Polyurethane WaterProof Jacket surrounding 2 ETFE insulated copper heating wires, metal jacket & ground wire drain

Distance from Toilet

Install 4-6" away from the toilet drain wax ring. It can be under the front of toilet - Approximately 20" from wall.

Trowel Size recommended

Minimum 3/8" x 1/4". Dependent on tile size - verify with tile/mortar manufacturer

Minimum Installation Temperature

50° Degrees F / 10° Degrees C

UPC 840213195403
Manufacturer Watts Radiant
Safety Listing UL (Underwriters Laboratory) Listed for U.S. and Canada under UL 1673 and CAN/CSA C22.2 No. 130-03, File No. E185866
Voltage 240 VAC
Cable Length 783'
Cable Length (inches) 9396"
Cable Length (meters) 238.7 m
Heated Area Size Covered 200
Wattage per SF 12
Total Watts 2400 watts
Amp Draw 10
Heating Power Output per Hour (BTU) 41 BTU per Sq Ft/Hour at 3" spacing
Heating Power Output Total 8200 BTU total
Spacing of Heating Wire 2.5" - 3" - 3.5" on center
Power Lead Length 10 Feet
Power Lead Wire Gauge 14 AWG
Power Lead Type Armored, NEC color code, Single point connection at 1 corner of mat. No return wire like inferior products
Thickness .110" - .132" (nominal) Shorter cables are thinner.
Ohms Reading (resistance value) 20-26
EMF (Electro Magnetic Field) Yes. Verified by Independent Testing Laboratory as ultra low.
What's In The Box WarmWire Spool in Easy to dispense box. Detailed Installation Manual. Installation video online.
Brand Name WarmWire
Warranty from Manufacturer 25 year warranty backed by USA Manufacturer since 1873
Why Helps

WarmWire = Zero EMF

Electromagnetic fields (EMF) are generated by all electrical devices, and the possible dangers of exposure to EMF are still the subject of debate and scientific research. Out of concern for their customers' safety, SunTouch created the first EMF-canceling electric radiant floor heating system in 1993, and to this day they only manufacture and sell floor heating systems that use their patented EMF-canceling design. We provide this EMF information because it is important to some people, not to frighten you or exaggerate any risk like others do. We simply aim to inform you and leave the choice up to you after explaining what we know.

Acceptable Floor Coverings Natural Stone,Tile, Laminate, Engineered Woods, Carpet, Vinyl, Linoleum, Solid Hardwood (if you use sleepers)
Spacing between runs 1 2.5
Spacing between runs 2 3
Spacing between runs 3 3.5
Heated SF 1 168
Heated SF 2 200
Heated SF 3 240
Watts Per SF 1 14.4
Watts Per SF 2 12
Watts Per SF 3 10.3
BTUs/SF/Hr 1 49
BTUs/SF/Hr 2 41
BTUs/SF/Hr 3 35
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