SpeedComfort Starter Set Duo: Smart heater fan for heaters - Long-life heater booster for underheaters and radiators - to save energy and heating costs Features: More comfort: Thanks to the increased air circulation and improved heat distribution, the heat rises faster and more evenly in the room. Thanks to the quiet drive of the SpeedComfort fan heater, the quietness in the home is not disturbed Easy install: The fan heater is very easy to install and suitable for almost all radiators. Once installed, the SpeedComfort works independently with a temperature sensor so that no electricity is consumed when switched off and only 0.55 KWH per SpeedComfort per year is consumed when switched on Sustainability The energy-efficient heating fan improves the release of warm air to the environment, doubling the heating capacity. This faster and more efficient operation allows the thermostat to turn off sooner. Thanks to the better heat distribution, you save up to 22% on your gas costs Automatic o