Car Pre-Heater - Cayenne in a Cayenne

As we had a cold winter time this season (-10 degree Celsius) and my car was very cold inside every morning although I have a garage, I decided to use my Raspberry Pi. Therefore, a relay should switch on a 2kW heater on my request. After breakfast I can switch on this heater to pre-heat my car with ease - even with my smartphone. The heater I put in the car when I come home and remove it before I drive away. Of course, the solution is usable only at my home garage. It works well and since I can start my day without freezing although I wear just a thin business shirt.