Varshine Happy Home || Laurels Fan Heater Heat Blow || Silent Fan Room Heater (White) || with 1 Season Warranty || M-02 A fan heater is a heater that works by using a fan to pass air over a heat source (e.g. a heating element). This heats up the air, which then leaves the heater, warming up the surrounding room. They can heat an enclosed space such as a room faster than a heater without fan, but, like any fan, create audible noise.