auxiliary heating [2]
electric baseboard radiator 
Device using electricity to heat air by drawing it in at its base and releasing it at the top by convection.
deflector 
Part directing the heated air toward the room.
thermostat 
Mechanism that, by sensing changes in temperature, will automatically switch the radiator on or off.
fin 
Projecting metal rib attached to the heating element; it increases the heat-emitting surface area.