Hi everyone. Thanks for all the responses and advice. It does help. I need to be more clear on my idea and better explain how I could easily achieve my goal of a hot bath every night. Here it goes.
I would install an RV 60 gallon tank (71"L x 18"W x 12”H) between my bed (Twin XL) and floor. The tank would be fully insulated minimizing the power to keep a consistent heat. The hot water would also keep my bed warm so I wouldn’t need much heat at night. The big question Ive noticed is “how would you heat the water?” My idea is to heat the incoming fill water with propane by using something like this.
http://www.amazon.com/Eccotemp-L5-Portable-Tankless-Outdoor/dp/B000TXOJQ4.
Once I have the hot water I could maintain temp with this
http://www.amazon.com/Suburban-520789-1440W-Electric-Element/dp/B003G9G4X4
Using golf cart batteries to power element.
Or I could fill my tank with cold water and heat incoming bath water with tankless water heater.

u/joe_valuable · 1 point r/GoRVing

https://www.amazon.com/Suburban-520789-1440W-Electric-Element/dp/B003G9G4X4

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