Electric fireplaces offer a cozy ambiance and warmth. Logs glow, simulated flames flicker, and heat is pushed into the room by an internal fan. You can select "flame only", "heat only", or heat-and-flame combinations on most models. These fireplaces can be operated from mantle-mounted controls or by remote, and the brightness of the flames can be adjusted to suit your mood on some models. The amount of warmth generated varies among manufacturers and models, but normally around 4,500 BTUs of heat is generated from an average unit. However, electric fireplaces are not intended to replace a heat source. They are built to provide comfort and a focal design element in a room.