Dan, have you engineered one of them yet so I can add it to my porty? I can see if you have adjustable flow water through the tank you could put this up the hill a ways and then have a hot shower downhill.
What did the army use them for? hot water for the Kitchen? Or do you extend the pipe up through the tent and have a nav gas/kerosene tent heater humidifier? Using the water as a heat sink. I see it has an adjustable spigot for more or less heat.
I can definitely see Mikey burning his eyebrows with that...