Solved..?
Managed to get a 1800 number for StewartWarner/Southwind in the U.S. They are in the middle of a production run for this heater. Developed in the early 70s, the heater burns anything but primarily diesel. There's no one left at the company who wa there 30 years ago so they can't tell me exactly the military application but I can purchase a manual for one. By deduction, and the obvious lack of an internal coolant pump, the heater is likely for the 2.5 to 10 ton diesel SMPs. Canada had some of the 5 & 10 tonners of that pattern in the 70s and may still for heavy low bed hauling of tracked vehs.
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Cheers all.
JD
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Here we go in bull low,
stuck in four wheel drive....
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