FreeCAD: Off-Grid hot water system

This design combines rain water collection and a rocket stove.

The stove has three circuits, controlled by the dampers:
1. A bypass (direct to chimney), to start the stove or or use just the stove.
2. The hot water tower with internal coil, for the shower and tub.
3. The tub ring to heat the tub, (all the internal voids could be filled with fiberglass or perlite).

The water plumbing has hot and cold to the shower mixer. The shower hot runs through tower coil. The sink hot runs direct from the 20 gal. pot.

For an outdoor hot tub, I think a thermosiphon (copper coil wrapped around a riser) would work great. But for a small indoor bit of plumbing, a gravity powered system might be best, it's always on and no lifting required.

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