How to Install Radiant Heat in Your Bathroom Floor


Because the tile on a bathroom floor it can get very cold, especially in the winter months, it is great to have a radiant heat barrier on your bathroom floor to keep you warm. If you are prepared to remodel your bathroom floor, then the following instructions will guide you through the process of installing an electric radiant heat system before you replace those ceramic or stone tiles.

Prepare the Floor

Measure the area where you wish to install the radiant heat wires. Be sure that the walking floor is the only part that you consider. You will not be installing the heated cables under cabinets, tubs, or other fixtures. Also, keep the wires at least 6-inches from the wax ring of the toilet. After you do your measuring, plot the space on graph paper. Bring the sketch to your home store.

Install Electric

If you are installing a mat style of radiant heat under your tiles, contact a licensed electrician to install the 20-amp circuit to ensure that the project is completed according to building specifications in your area. An electrician should check the radiant heat mats to ensure that there are no shorting circuits. They can install the ground fault circuit interrupter at the same time.


Lay the mats in the design that works best for your floor space. Remove a mat and put a thin layer of thinset on your floor to hold the mat in place. Doing so will ensure a stable and flat surface for the tile. Press the mat into the thinset to hold it in place. Continue with the rest of the mats until they are adhered to the floor. Each mat will have plugs to connect each mat to the other for a continuous circuit.

After the Mat Is in Place

Once the mat is in place, connect the wires to the setback thermostat and the GFCI circuit, then test to ensure that the entire mat assembly heats evenly. You can use a small thermometer to test different parts of the floor. Now is also a good time to verify that there are no heating cables too close to the toilet or other fixtures in your room.


Put another layer of thinset over the mats and begin installing your tile. Manufacturers require that the tiles be of a stone or ceramic style. Linoleum tiles and carpets are not flame resistant and could melt or ignite.