In this video I show how much a block heater effects an engine when its cold outside. On the truck model I have it shows internal temps so I took a reading before plugging the truck in and after. The results are very good having a block heater.
Pro Tip: If you don't want to waste to much power it is not necessary to plug your vehicle in all night. 2-4 hours is all that is needed to get a healthy start for your engine in cold climates.
