Ive acquired an inline heater for my truck. Ive had it in the garage for over a year now, im thinking on installing it this season, to put it to good use. Any one else have one? Its also a 1500 watt model, is that overkill?? It was free, install or sell it...?

What other heater types do you cold weather guys use. Magnetic heaters on pan ect ect.