Turn off power to the electric baseboard heater from the main power supply source.
Lift up the bottom edge of the heater's cover. Remove the cover's top edge from the mounting hooks to expose the wiring. Set the cover aside.
Hold a circuit tester against the wiring to ensure no power is being supplied to them.
Unscrew the wire nuts holding the wiring connections together. Separate each wire. Loosen the cable connector's screw with a Phillips screwdriver so the wires can move freely in and out of the electric baseboard heater.
Remove the screws driven through the back of the electric baseboard heater and into the wall using a drill and Phillips driving bit.
Pull the heater forward, away from the wall.