Nice video Rex! I can see uses for this and maybe using a 30 gallon black barrel. When I was in RVN we used just a HD black plastic rubber liner in a 2000 tank that was raised up over the tents for our company hot water supply. Hot showers were really liked over there. Ofcourse it was really hot over there incase you weren't enjoying military life then!
I use 2 30 gallon barrels-1 for cold and dark blue for hot and a coleman pump sinks to the bottom , hot shower time after a long hard cold day underwater sure is nice. The shower stall doubles as a sit on toilet closet as in DC. Home built and goodn' cheap-JohnJohn