Guide on Installing a Bathroom Heat Lamp

Quck answer

To wire a bathroom heat lamp, follow these steps:

1. Turn off the power to the bathroom circuit at the main electrical panel.

2. Remove the existing light fixture and disconnect the wires.

3. Mount the heat lamp fixture to the ceiling, following the manufacturer’s instructions.

4. Connect the black wire from the heat lamp fixture to the black wire from the electrical circuit, and secure them with a wire nut.

5. Connect the white wire from the heat lamp fixture to the white wire from the electrical circuit, and secure them with a wire nut.

6. Connect the ground wire from the heat lamp fixture to the ground wire from the electrical circuit, and secure them with a wire nut.

7. Install a new switch for the heat lamp and connect the wires to the switch.

8. Restore power at the main electrical panel and test the heat lamp to ensure it is working properly.


Stepping out of a hot shower onto a cold floor can be quite uncomfortable. To make your bathroom more comfortable, especially during the winter months, consider installing a bathroom heat lamp. This luxurious addition will provide warmth and create a relaxing atmosphere.

In this guide, we will explain how bathroom heat lamps work, important considerations before installation, and a step-by-step process for installation.

How Bathroom Heat Lamps Work

Bathroom heat lamps work by using an incandescent light bulb in an infrared heat lamp. This generates both heat and a small amount of illumination.

Despite producing heat, these lamps are energy efficient. The heat they produce is not considered wasteful, unlike the heat from a standard light bulb. However, it is important to note that they should not be relied upon as the only source of heat or light in the bathroom. It is ideal to have a separate switch to control the lamp so that you can avoid unnecessary heating.

Electrical Considerations for Bathroom Heat Lamps

The National Electrical Code is a set of regulations that ensure safe electrical installation and inspection. It is updated regularly to incorporate advancements in technology and safety requirements. When installing bathroom heat lamps, you should consider the following safety guidelines:

  • GFCI protection is required for larger circuits, including 250-volt, single-phase receptacles with a capacity of 50 amps or less.
  • You may need to install a dedicated circuit with its own breaker in the electrical box. This is necessary when using a single appliance, such as a heat lamp, to prevent the breaker from tripping.
  • Bathroom exhaust fan combo units with built-in light and heater require a dedicated circuit and a wall switch.

Installation Steps for a Bathroom Heat Lamp

Before starting the installation, make sure to turn off the breaker. If you are not familiar with wiring or electrical systems, it is advisable to hire an electrician for the job.

1. Verify Circuit Compatibility

Bathroom heat lamps require a significant amount of electricity. Ensure that the dedicated circuit in your home is suitable for the unit you are installing. If the circuit power is located at the switch, you will need to install two cables: a three-wire cable and a two-wire cable. The neutral wire is shared among all three elements of the unit, while the ground wire remains separate.

Step 2: Connect the Wiring

Route the two-wire cable from the breaker box to the switch box on the wall and strip about 1.5 inches of insulation from the ends to expose the bare wire. Attach these wires to the switch box. Then, connect the black wire to the single hole on the side designated for the heater. The red wire from the three-wire cable should be connected to the other side with three holes on the back of the switch box, directly across from where the black wire is connected. The black wire from the three-wire cable is then inserted underneath the red wire. Connect the black wire from the three-wire cable to the remaining third hole.

Step 3: Combine and Secure the Wiring

Twist the white wires from all cables together and secure them with a twist-on wire connector. Then, wrap electrical tape around the connection. Repeat this process for all exposed wires. Connect the red wire from the fixture to its corresponding wire and join all the ends of the matching colors together.

Safety Tips for Bathroom Wiring

  • Always wear safety goggles and appropriate clothing when working with electrical fixtures. Long-sleeved shirts and pants made of natural fibers can protect your skin from sparks, but avoid wearing polyester as it can melt and burn the skin.
  • Ensure proper grounding and prevent electric currents from flowing while working to ensure your safety during the installation of a bathroom heat lamp.

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