Engine block heater installed !

[trollbait]

For warming the engine and getting warm air, a thermosiphon is probably your best bet. It heats up the coolant and circulates it through the engine block by convection. An EBH really just does the block. Coolant will get heated indirectly by convection and/or conduction, but, depending on how the system is plumbed, it may not be enough to provide heat to the cabin.

Thermosiphons cost more, but the main hurdle is having a spot in the engine bay to mount it. Relying on passive convection means it has to as close as possible to the low point in the coolant loop.