Not all electric fireplaces use infrared heaters. It can be more common to find fan forced heaters in electric fireplaces compared to infrared heaters, especially in the lower cost models. Some electric fireplaces may not have any form of heater altogether.
As an example, we have 4 electric fireplaces in the house and 3 of them use fan forced heaters while 1 uses an infrared heater.
The type of electric fireplaces that we own that use fan heaters rather than infrared heaters include: