Aerospace experiment

Good Morning everyone I wanted to put mt 2 cents in on a project that I helped complete that was for Ga. Tech Aerospace Division I heated 4000 gals of water to 150degrees it took about 15hrs to complete. They were trying to keep a flame lit in water for an extended amount of time. They one thing I enjoyed was helping with an experiment.
 
That is cool. err...Hot. Since it was a large tank, and 4000 gallons of water, how did you maintain the temperatures for that long? Was the heat maintained, because of a constant feed of hot water, or did they have other heating elements in the tank, as well?
 
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