1. You need an extension cord outdoor to connect to your car, and according to ESA code, it must have the grounding wire (the third stud on plug).
2. Be care to boil the 5W30 oil if you turn on the heater all the time.
3. Car sold today don't need warm up, the idel is higher when the car starts in cold temp. Compare to rev in high RPM, cold start is nothing to engine.
4. The block heater looks ugly. I feel it like the zip on the pants.