Ecofan Original heat powered fan is effective on freestanding wood stoves. Increase comfort by moving warm air throughout your living space rather than just letting it rise to the ceiling above the stove. Saves energy costs by improving heating effectiveness and reducing the amount of wood needed. Starts automatically and adjusts its speed with the stove temperature. Runs best on stove surface temperatures of 230 F (degree Fahrenheit) to 650 F. No cords, plugs, or batteries are required. Whisper quiet and completely assembled. 1 year warranty.