The electrical parking heating system by the Norwegian company of DEFA is very useful in a freezing-cold weather, when starting the engine is difficult or impossible. The system helps save time and fuel, and limits engine wear. The basic version of DEFA is comprised of a heater attached to the oil sump, the engine block or fitted inside a water hose. Its extended version contains an interior heater and is capable of charging the battery. It also comes with a remote control and a timer.