Install Instructions

SunTouch UnderFloor is a safe and
efficient electric floor-warming product
for interior applications. It is intended
only for installation under a wood
subfloor in residential and light com-
mercial installations. It is not designed
for other purposes such as roof snow-
melting. Any use or installation of this
product other than what is stated in
this installation manual will void the
Limited Warranty.
SunTouch UnderFloor is designed
to deliver approximately 10 watts/sq.
ft. of floor area. The temperature of
the warm floor is dependent on how
well the floor is insulated, as well as
the insulating value of the flooring
materials. If the joist space is sealed
against air leakage, exterior rim joists
are insulated, and the underneath side
of the floor is insulated, most floors can
be heated up to 15°F warmer than they
would otherwise be. Due to the insu-
lating value of carpet, carpeted floors
may not achieve the same temperature
rise. The floor may or may not achieve
this temperature rise, and no represen-
tations are made regarding the perfor-
mance of any system.
For best results, install unfaced
fiberglass R-19 or R-13 (or equivalent)
below the mat. Do not insulate below
the mat with more than R-19, and no
more than R-11 total on top of the
subfloor, including all floor coverings,
rugs and other items placed on top.
SunTouch UnderFloor can be used to
heat a room, as well as warm the floor,
provided the heat loss of the room
falls within the mat’s capabilities. A
designer must determine if the out-
put from the SunTouch UnderFloor is
Shielded
power lead
INSULATION
(MINIMUM R-13)
SunTouch UnderFloor
™
mats are only intended for installation
below the subfloor.
Shielded power leads make for a tougher and
safer connection to the controls.
2 SunTouch UnderFloor Installation Manual
Introducing SunTouch
®
UnderFloor
™
enough to match the heat loss of the
structure. Refer to page 3 for helpful
design guidelines.
The SunTouch UnderFloor Mat
The mat is composed of a heating
cable, a foil “radiator” to make a radi-
ant surface, and a set of power leads
for connection to the floor-sensing
control. These mats are manufactured
in sizes suitable to heat joist bays
spaced 12”, 16”, and 19.2” on center.
Mats are rated either 120 VAC or 240
VAC. Select the mat length to fit into
the joist space available. Multiple mats
can be used to fill a larger area, how-
ever they must be wired together in
parallel (not in series) if they are to be
connected to the same control. NEVER
combine 120-VAC mats with 240-
VAC mats.
Visit www.warmyourfloor.com or
866-558-3369 if there are any questions
regarding the installation of the mat or
its related electrical components.
Subfloor
UnderFloor mat
(with 2” air gap
above the mat)
Insulation
Floor joist
Cross section of typical
UnderFloor installation