No, I don't need one, was just curious about its power draw. So, if it's plugged in overnight for 10 hours, it'll draw about 4kWh which is (at $0.20 per kWh) about $0.80 per day. Not too shabby.
I look at this way, how much is easier starting, less wear and rear on the motor worth to you, IE quicker warm up in sub zero temperatures is much easier on the engine.
Cost of 2 large Starbucks would almost run the damn thing for the winter LOL
Pat.