Specification
SunTouch UnderFloor is a series resistance heating cable assembled into a
foil "radiator" surface. It is installed indoors under a wood subfloor between
the joists in residential and light commercial applications. Floor coverings
above may be any type, with a maximum of R-11 total insulation for all layers.
SunTouch
®
Underfloor
®
120 and 240 Voltages
For Residential and Commercial Applications
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ES-ST-Underfloor
This Engineering Sheet is not intended to provide full installation instructions
and safety information. In order to avoid property damage or injury, please refer
to the complete installation manual and product safety information provided
with the product.
Never cut the heating cable or damage it in any way. Do not install Under-
Floor mats in mortar or cement, or install them in the same control zone as
HeatWeave mats or WarmWire cables. These products have different heat out-
put, and are manufactured for different applications. Use only the attachment
methods as described in the Installation Manual to fasten the UnderFloor as
other methods may damage the heating cable.
Specifications
SunTouch UnderFloor is available in various lengths with voltage
options of 120 or 240 VAC.
• Measure and certify the correct wire resistance (ohms) value for the
heating cables, record these readings in the chart provided in the
installation manual.
• Use of manufacturer’s alarm meter (LoudMouth™ meter) is
recommended during installation.
• Verify that the area below the subfloor is clear and clean of sharp objects
such as nails from above, and is ready to receive work.
• Install the floor sensor in accordance with installation manual.
• Completely unroll the mat to make sure it fits between joists
and obstructions.
• Use finish staples to secure the mesh edging to the joists, 2" (51 mm) below
the subfloor.
UL Listed for U.S. under UL Standard 1693 and Canada
under CAN/CSA C22.2 No. 130.2-93.
Listing file number E185866.
Installation Guidelines
Supply Voltage
120 VAC, 1-phase
240 VAC, 1-phase
Amp Draw
120 VAC: 1 amp per 10 sf.
240 VAC: 1 amp per 20 sf.
Maximum Circuit Load
20 amps (15 amps with SunStat
Control)
Wire Spacing 2-3/4" (70 mm) o.c.
Maximum Allowable Temperature
194°F (90°C)
Continuously
EMF
Less than 1 milligauss
Heating Elements
Oxygen-free copper or
nickel-copper
Insulation ETFE Fluoropolymer
Ground Braid Stainless Steel
Minimum Allowable Bend Radius 1" (25 mm)
Application
Parameters √
Watt Density 2-3/4" (70 mm) o.c. 10 W/sf
Allowable Floor
Coverings
Tile/Stone
Carpet
Hardwood
SunTouch product specications in U.S. customary units and metric are approximate and are provided for reference
only. For precise measurements, please contact SunTouch Technical Service. SunTouch reserves the right to change
or modify product design, construction, specications, or materials without prior notice and without incurring
any obligation to make such changes and modications on SunTouch products previously or subsequently sold.
electric floor heating & snow melting