Installation Guide

ThermoShower™ Mat
Installation Guidelines
Installation shall be made in accordance with the National Electric Code, NFPA-
70. Final acceptance is to be made by the Authority Having Jurisdiction (AHJ).
ThermoShower™ is manufactured to be waterproof and may be installed in shower
applications by following these installation instructions and all local and national electric
codes.
It is highly recommended to connect InstAlarm® during the installation to
warn about accidental damage to the heating or lead wires.
1. Verify that ThermoShower fits the shower floor and drain location. Mesh can be
cut to make minor adjustments in fit. DO NOT CUT HEATING WIRE. Free-wire
(heating wire free of mesh) can be used to make transitions or adjustments as long as
minimum 2” spacing is maintained between heating wires. Maintain a soft turning radius
when flexing the heating wire to insure that the heating wire is not severely creased at a
90 degree angle. Attach mat or heating cable to the subfloor using hot glue or thin strips
of duct tape.
2. Install floor thermostat sensor wire by weaving the sensor probe in ThermoShower’s
mat mesh evenly spaced between two heating wires.
3. Never make a field splice or repair to any section of the mat installed inside the
shower area; serious hazard could result.
4. Completely embed ThermoShower mats and lead wire including connection in
minimum ½” thick thin-set mortar with no air gaps.
5. Install/apply a water-proof membrane above the imbedded heating mat following the
membrane manufacturer’s instructions. Membranes should add negligible R-value.
6. Check heating mat electrical resistance at all intervals during the installation using an
Ohmmeter or multimeter. Contact Thermosoft technical support if heating mat
resistance is more than ±10% of the factory resistance marked on the label.
7. Install ceramic tile, marble, porcelain, stone or other masonry surface.
8. The thermostat or other control must be located at least 4’ away from shower
openings so the thermostat or control is not exposed to water or within reach of a
person taking a shower. Lead and sensor wires can be extended if required to reach the
thermostat location but FIELD SPLICES CANNOT BE LOCATED IN THE SHOWER.
9. Connect the mats to a Class A (5mA GFCI) thermostat (or separate Class A GFCI in
the circuit).