We just finished the hot water heater installation. While we were working on the water system modification, we also added the provision to winterize the water system. We made a little fitting that snaps into the jerry can quick disconnect under the sink so that compressed air can be used to blow all the water out of the system.
We ended up going with the 12V Elgena NC6-E Water Heater from Total Composites. It seems like a nice little unit, and we think it is about the right size for the intended use. It takes a little while for the water to come up to temperature, but after testing it, it seems to play nice with the solar panel system in the truck. The water heater draws around 200 Watts, so as soon as the heater kicks on, the charge controller starts charging the batteries. With 600 Watts of solar panels on the roof, the battery capacity never drops below 100% while the hot water heater is running on a sunny day. Pretty slick.
We put a quick disconnect in the shower to easily disconnect a stainless braided 5 foot long shower hose and spray head. It’s a nice length because it can reach out through the door of the habitat, so you can choose to shower indoors or outdoors. Prior to our trip, several people said that they liked to shower outside and we were a bit skeptical. However, we found that we completely preferred showering outside during our trip, so I’m not sure that we would use this setup to shower inside very often, but it’s all set up for indoor or outdoor showering with hot water now.
We’ve also been doing a lot of little things on the truck. The truck is in about the best shape it has ever been.