Plumbing consists of:

• Toilet
• Shower
• Sink

I am using an Incinolet toilet. It's essentially a stainless steel incineration chamber with a toilet on top. After using the toilet, it drops the waste into the chamber and incinerates it into about 1 T of sterile ash. The only smell inside the bus is one similar to that of hot metal, certainly not of waste, and I can't smell anything outside of the bus. It's energy intensive, but I have a beefy electrical system.

Since the toilet and shower are the only 'rooms' on the bus, it seemed like it would be nice to easily relocate them. The incinolet needs only a roof vent, and the shower needs only a floor drain, so that's only two holes that need to move.

Hot water for sink & shower will come off of a heat exchanger on the diesel furnace used in the heating system. The furnace is 30 kBTU/hr. That's 1°/hr change for 30,000 pounds of water, or 3750 gallons for 1°/hr, or 1.5GPM by 40° change, which should be enough to handle a continuous shower, once the heat exchanger gets hot (presuming I divert all the energy from the furnace to hot water, which isn't a problem).

After some use, I'll figure out if I just need a switch to automatically turn on the furnace, or if I'll preheat before use, or if I want a small hot water tank to get 'instant' hot water while the exchanger catches up. Another possibility is to just use a small electric heater for the sink (which generally needs very small amounts of hot water quickly), versus turning on the furnace a minute or two before showering.