A electrical heater is best in a urban environment. If you are planing to leve your car outdoors on several occations at a public parking or in the woods/nature the dieselboiler is the shit due to that it don't need the coord.
As you describes you have a carport/garage whare you have electricity. I would in your case if I'm not going out on hikes, and want to leve my car for weeks choose the electrical one. It is cheaper both as it is and to install, and i reccon any Swedish workshop now how to install. The Dieselboiler is harder to install and more expensive, but it gives you more freedom.
/Magnus
Till att börja med. Ber om ursäkt för min applesi (apple dyslexi). Ipaddan och jag är inte alltid överens om vad som skall stå...