circulation pump for hydronic heater

HINO SG

Adventurer
Anyone have ideas on a source for a inexpensive 12v water pump for the d.i.y. hydronic heater I'm designing for my box truck?

Low current draw is the biggest priority- seems like 1 gpm would be enough.

What's going to happen if I run water/antifreeze through a fuel pump?

My truck has on-board compressed air, so if I could figure out how to circulate water in a closed circut using compressed air, that would be better yet.
 
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