D4D diesel engine heater

[HDS]

I learned that my 2007 Yaris D4D has a diesel driven engine heater that gives supplemental heat.

I am wondering if it's possible to modify it in such a way that it can be turned on when the car is not running and it can be used to heat the cars motor in winter time.

Currently I am using an electric block heater but electricity prices are through the roof in Finland and I am looking for alternatives to using electricity.

[bronsin]

How much is a kilowatt hour in Finland? I used to use a 700 W hot plate Under my diesel Mercedes in 5° below zero weather. I could turn it on from a switch inside the house when I woke up for half an hour so that’s like a third of a kilowatt hour. If a kilowatt hour in Finland is a dollar it will be $.33.