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My roadster has an aluminum tank. Much smaller than 20 Gal. What are you building?
You might consider isolating the hot water tank from you.... being doused with 160-210 degree water will ruin your day. Think about what might happen if you blow a head gasket and get compression pressure in your tank. Your cap pressure relief may not let pressure out fast enough to prevent a tank failure.... consider that when building your tank... rounded corners, internal braces... Good luck with your project.
We have a 25 gal aluminum water tank right behind the drivers seat. It was an easy way to get 200 lbs of ballast over the rear axle for dual purpose. Our tank is not pressurized as we use an electric water pump and have a large overflow coming from the top of the tank exiting out the bottom of the car.
My water tank is located behind the driver we built it using aluminum .060 thick capacity is 17 gallons I placed the firewall in front of the tank so if any leaks develop no hot water is getting on the driver I also do not run pressure in the tank I found out long ago any shape other than round will not hold pressure without bulging and bursting. Ronnieroadster
We have a 10 gal. compressed air tank mounted in the front of our rear engine lakester. .090 Aluminum bulkhead between tank and driver. Had to weld tube between top rear and bottom front of tank for steering shaft to pass through.
keep in mind the "SLOSH" of the chute hit---baffles and edges reinforced---also twist and flex of frame loading and unloading as well as jacking