In article . net,
Lew Hodgett wrote:

They wouldn't; however, pumps and fans add up.

SFWIW, there are at least a couple of manufacturers who provide stand
alone oil fired heating systems for trucks and buses.

You can take your meds and go back to sleep now.

Lew

and why would the design engineer spec an electric pump for the job of
moving cooling fluid around when there is this really BIG engine with
a pile of HP sitting right there, that already has a nice pump on the
front? Just how many low voltage fans does it take to spread the engine
heat around a bus, and just how many AMPS do they draw? Not anywhere
near 200 AMPS.....like MAYBE 20 AMPS if they really had a LOT of fans,
amd wanted to COOK the passengers.

Me maybe you should cut down on your meds, and get a CLUE....