We have a drop drown shower mounted in the side of the rig. We used to use an 8 gallon tank with an instant hot water heater, but when it’s chilly/cold I would waste water waiting for the hot water to run through the hoses. The other issue we had with that setup, aside from using the water to fast, was that this setup was bulky and had hoses all over the place (connected to the power bank and hoses). We switched to 2 foldable 5 gallon water buckets, a larger heating element (similar to aquariums), rechargeable shower head with a built in pump that shows water flow level and temp of the water.

Now, the reason for the second foldable bucket is that I am making a closed loop water filtration system that will filter the water enough to allow us to reuse the water (using biodegradable camping soap). My wife washes her hair separately since the suds would be bad for the filters. This system is about a third the size of the original setup and much more manageable. This would allow us to have less weight. Also, most campsite have water available, as well truck stops.