Block heaters devices that are designed to heat up your engine’s fluids prior to starting. In some climates, this is a very important component to the dependability of your car starting. For example, in sub-zero climates, it is extremely hard on your engine starting when the fluids are very cold and thick. A block heater, heats up the engine oil, antifreeze and the engine block to help reduce wear on the internal components. It also enables the heater to blow hot air much more quickly.
Block heaters are not necessary in warmer climates and are pretty much unheard of in areas like Florida and Arizona. In other areas that see extreme temperature changes, block heaters can truly save the life of your vehicle and ensures that it will start in colder climates.