Re: Hot water?
I'm in the middle of my homebuild, but my current theory is this:
Washing dishes only takes about a liter of hot water in a tub. Easily attained on your stove in your kettle. Same goes for a little washrag wipedown if needed.
As far as a full blow shower goes, I'm with EM rider. I don't know that i would want the big wet mess right at the back of the van. Take your solar shower in the woods, or warm up some water and put it in a pump up garden sprayer and use that. There is a company that makes essentially what is a stainless pump up garden sprayer that you warm over a burner to create a portable shower. Simple and effective, and you could easily use stream water instead of having to rely on your potable water source in your van.
Lots of different schools of thought, so I guess it mostly depends upon your intended usage. Don't get me wrong, if I find an Espar Hydronic at the right price I will most certainly mount it up. However, for the space of a fixed hot water heater tank I'd personally rather have the storage space. ymmv.
2009 Express AWD, CCV Top & 50-ish home build. Daily driver/camper/kid hauler