Homebuilt Onboard Shower

heater coilThis particular writeup is based on a Ford Bronco shower install, but it's a great starting resource.

One of the most interesting parts is how Marlon used a refrigeration supply 'coaxial coil exchanger' that costs less than half of the standard heat exchangers found on Ebay. He says it actually works too well, so if trying this, be careful not to burn anybody!