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SunTouch UnderFloor 12" x 10.5' long 120V 0.9A

SKU# 1201012U2ST

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SunTouch UnderFloor is a safe and efficient radiant electric floor heating system retrofitting an existing cold floor with heat without disturbing the existing floor covering.

UnderFloor is for interior applications only and is intended only for installation under an existing wood subfloor (accessed from underneath via crawl space, basement, or garage ceiling) in residential and light commercial installations.

Insulation is essential after mats are installed into joist spaces.

We recommend SunTouch UnderFloor Mats be installed in all areas where floor warming is desired; the floor is only warm directly over an installed mat.

If UnderFloor is being installed to heat the space, first perform a heat loss calculation to determine the amount of BTUs required to heat the space.

Instructions + Video

Instructions + Video

Instruction Manual
Install Steps

Installation Steps

SunTouch Underfloor Installation Step 1

Step 1

Unroll mat and staple 1 side to side of first joist so foil will be 2 from Sub floor above and hangs down like a curtain.

SunTouch Underfloor Installation Step 2

Step 2

Staple other side to opposite joist. Each mat must fit within a single joist bay.

SunTouch Underfloor Installation Step 3

Step 3

Mount Electrical boxes and connect mats in parallel to power in junction boxes. Follow applicable building and electrical codes, using conduit to electrical boxes as required. 15 amps maximum per thermostat. If you have only a few mats, the power leads may reach the thermostat without a Junction Box.

SunTouch Underfloor Installation Step 4

Step 4

Connect the SunStat thermostat and test the system. Then install fiberglass insulation batts (R-11 to R-19) up to the mats. Insulation must be installed at the ends of the joist bays vertically or 6 inches after the mat ends.

Kitchen Layout Example Using UnderFloor Mats

Each electric UnderFloor heating mat is designed to be installed in a single joist bay. The heating mats cannot be cut shorter to fit a shorter joist bay or altered in any way.

Do not try to fill multiple joist bays with 1 mat. However, multiple mats may be installed in a joist bay where there are obstructions (such as cross bracing) as long as they do not overlap or touch.

In this layout, four 9.5'x16" and eight 4'x16" mats are required to warm the floor area.

Kitchen Layout Example Using UnderFloor Mats

The heat mats are wired together in parallel (not in series) in junction boxes below the floor, then an electric wire is fed over to the SunStat control.

Mat lengths should be selected so they fit completely within each bay and allow for the easiest wiring. When all the power leads start on one side, it will be easy to wire them together in the junction boxes. Code requires junction boxes to remain accessible at conclusion of the job.

Skill Level Installation only by qualified persons. Electrician recommended for wiring. Read More
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.

GFCI / GFEP Protection Required for each circuit. Built-in to all SunTouch SunStats.
Maximum Circuit Load 15 Amps
Maximum Circuit Overload Protection 20 A Breaker.
Electrical Box Size Extra-deep single-gang box for 1 or 2 leads, Or 4" square deep box for 3 cables (extra room needed for Wire, wire nuts, control)
Full Length End-to-End ground wire Yes.
Wire Construction ETFE Fluoropolymer, metal shield and Radiant Foil
Repair Information Yes, Wire can be repaired. Repair kits and assistance available.
Layout Flexibilty Yes.
Expected Floor Temperature This is dependent on many factors. A well-insulated floor can ensure better performance.
Insulation Recommended Yes, required. See Installation Manual for specifics
Indoor/Outdoor? INTERIOR floor heating Application only. Never embedded in Mortar.
Acceptable Sub-Floors Stapled to sides of Joists.
Distance from Toilet See manual; 2-8" from most. Do not let foil touch any metal
Minimum Bend Radius Do Not Bend or remove wire from mat or Foil
Cut Warning No. Never cut the heating elements or foil to shorten
Minimum Install Temperature 50° Degrees F / 10° Degrees C


UPC 840213080709
Voltage 120 VAC
Wattage per SF 10
Heating Power Output per Hour (BTU) 34 BTU per Sq Ft/Hour
Heating Power Output Total 357 BTU total
Manufacturer Watts Radiant
Power Lead Type Armored, NEC color code, Single point connection at 1 corner of mat. No return wire like inferior products
Power Lead Length 10 Feet
Power Lead Wire Gauge 18 AWG
Thickness 0.125 (less than 1/8")
Spacing of Heating Wire 2.5" inches
Resistance Value 121-148 ohms
EMF (Electro Magnetic Field) Yes. Verified by Independent Testing Laboratory as ultra low. REET test
Thermostat Control Required? SunStat Floor sensing thermostat
Conduit Required? Conduit does make installation easier in new construction
More Details

More Details

What's In The Box Mat, Detailed Installation Manual.
Brand Name SunTouch
Warranty 25 Year backed by 140 year old USA Manufacturer
Why Helps

UnderFloor = Zero EMF

An emerging issue in the electric radiant heat industry is EMF (electromagnetic field) radiation. SunTouch pioneered and sells only ZERO EMF products constructed with active dual wire EMF-canceling technology.

All SunTouch products use a complex wire construction with two heating elements in parallel with an added and patented helical twist to eliminate EMF. Other electric radiant floor heating companies sell single-wire systems that release high levels of EMF when compared to SunTouch.

What is EMF? Electromagnetic fields (EMF) come from all electrical appliances, but studies show an average American's daily exposure is less than 1 unit (mG) of EMF. But. when you sit on an unshielded electric radiant floor, you may be exposed to 20, 40, or more times the average daily exposure. This Data comes from Independent testing. Read More Here

Is limiting exposure to EMF important? No one is certain. The World Health Organization says the data is inconclusive to date, but continues their research. We provide this EMF information because it is important to some people, not to frighten you or exaggerate any risk.

For many years customers have chosen SunTouch Zero EMF systems, but we leave the choice to you after explaining what we do know.

Amp Draw 0.9
Total Watts 105 watts
Size in Inches 12" x 126" (12x126 inches)
Size in Feet 1' x 10.5' (1x10.5 feet)
Size in Meters 0.3m x 3.2m (0.3x3.2 meters)
Custom Size Options None. Standard Sizes only. No customization possible
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
Acceptable Floor Coverings Natural Stone,Tile, Laminate, Engineered Woods, Carpet, Vinyl, Linoleum, Solid Hardwood

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Write Your Own Review

  • Easy install

    I installed the product and got an electrician to hook it up. Floor started at 66 degrees and now is maintained at 80-84 degrees depending on time of day. Very good.

    Posted on December 19, 2015 by cramam

  • Excellent!

    Yes, it was as easy as the installation guide makes it seem & works great. The floors (tile) just get slightly warm but enough so you definitely notice it when in bare feet!
    Most time consuming part of the install was breaking off all the ends of the screws protruding thru the floor that were securing the tile underlayment. The actual product...

    Posted on May 16, 2015 by JBendo

  • It was very easy to install, and works just as advertised.

    I am very happy with your product! It was very easy to install, and works just as advertised. So very few things actually do what they say they will. The thermostat works flawlessly. For my size project, the loud mouth wasn't really necessary, but since I will probably buy more of your product, it will be available.

    Posted on March 31, 2015 by Jeff W

  • They do exactly what I was hoping to achieve.

    I had no trouble with installation of your products and I am very satisfied with the results. They do exactly what I was hoping to achieve a gentle warming of my problem floor areas that made sitting in the dining room area uncomfortable on socked feet and getting out of the shower a chilling experience.

    Posted on April 28, 2014 by Frank Mendlik

View All Reviews

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