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How To Install ThermoTile Floor Heat Cable

Whether you'd like to enjoy radiant floor heating in your kitchen, bathrooms, family room or anywhere else, simply plan your radiant floor heat installation and take these 4 simple steps:
  1. Lay out the cable using FixFast cable hold down straps
  2. Spread thin-set mortar
  3. Lay tile
  4. Connect thermostat and enjoy.
ThermoCable Installation Image One
Step 1. Lay out ThermoTile heating cable on the room's subfloor.
It's always best to start with a floor heating layout plan or drawing and take pictures of your installation.

Install FixFast cable hold down strap every 4 ft.

ThermoTile heating cable has a 10' lead wire that needs to be connected to the thermostat. Follow a layout plan and start the heating cable(s) where the lead wire(s) reach the thermostat.

Loop the heating cable back and forth securing to with the FixFast cable hold down strap. Use hot glue to adhere cable to the subfloor when necessary to fit in irregular spaces.

Keep heating cable 3" from walls and fixtures and 4-6" from toilet rings.

Be careful not to cut or damage the floor heating cable.

Pull lead wire(s) & sensor up conduit.
Pull lead wires up conduit to the electrical box for connecting to the thermostat. Connections to the thermostat will be made later. (It is recommended to connect the heating cable lead wires to InstAlarm to monitor the installation and sound an alarm if an accident damages the heating cable ) Pull the thermostat sensor wire up a separate conduit or attach it to the stud.

Install sensor probe between heating wires
Before applying thin-set mortar over the radiant heating cable, be sure to place the thermostat's floor sensor evenly spaced between two heating wires. Groove the subfloor a little if necessary to nest the sensor probe so that the floor will lay flat. Duct tape the sensor in place to ensure it does not move during tiling.
Fixfast Cable hold-down strap


ThermoTile Cable Installation Image Two
Step 2. Spread thin-set mortar over ThermoTile or pour self-leveling cement.
Plastic trowel If spreading thin-set mortar directly over the radiant floor heating cable in one step, we recommend using a plastic trowel to prevent cutting the heating wires.
Or, you can use the flat side of the trowel, and float a skim coat of thin-set that just covers the heating wire, then lay tile in a second step.
Or, you can pour a layer of self-leveling cement, let dry, then lay tile, laminate, carpet, linoleum or other types of floating and glued down floors.
ThermoTile Cable Installation Image Three
Step 3. Lay tile & apply grout. Follow normal tile & grout instructions.
Use a latex, acrylic or epoxy grout for grouting between the tiles. Latex, acrylic and polymers add flexibility to grouts to resist cracking. Epoxy grouts provide high strength, good thermal shock resistance and fast cure. Do not use sharp objects to clean the grout from between the tiles. Most damage to the heating cable occurs when excess grout is scraped away or a tile is removed to be re-leveled and a sharp tool goes deep enough to cut the cable. Call customer service for tips on removing tiles.
ThermoTile Cable Installation Image Four
Step 4. Make electrical connections.
Connect all wires to the appropriate terminals on the thermostat. If installing more than one heat cable, connect heat cables in parallel to the thermostat. Although simple to do, an electrician is required by the NEC and UL.
  • Line - power from the service panel to the thermostat.
  • Load - power from the thermostat to the heating cable.
  • Temperature Sensor - connect the floor sensor to the terminals marked "Sensor."
Note: Use 3/4" conduit and junction box when installing 5 or more cables per thermostat.
Detailed, easy-to-use instructions of installing radiant floor heat are provided with your order.
ThermoTile Cable Installation Image Five

For more detailed instructions, check out the installation manual:

Installation Manual preview image
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